06-07-2018 04:12 PM
99 ... 234
  1. BananaFishIII's Avatar
    I had the same problem on my 2 year old Nexus 5 a few months ago where once in a while when I would reboot my phone it would give the "optimising app # of #" (often exceeding 140).
    It was annoying since it took a good 10 minutes for it to finish, but since it wasn't often so I didn't think much of it.

    However, a few weeks ago it started to get to the point where the optimising screen would show up at almost every reboot.
    It also didn't help that I had problems with my battery where my phone would shut off completely while clearly showing I still had
    a good 80% of battery left.

    I decided to order a new battery from Amazon and replace it. It's been 2 weeks and I've still had no problems with the optimisation or the shutdowns, so I'm assuming it was related to the battery.

    I would give a shot at replacing the battery, mine was relatively cheap (20$) and pretty simple to replace.
    08-26-2015 09:09 PM
  2. littleburrito's Avatar
    I am now having the same issue! Last night, the "power off" option came up when i wanted to dim the screen (which i didnt press to confirm turn off), but the phone turned off anyway. So i thought I must've pressed it by accident. Turned it on, and the "optimising app x of x" window came up, went to bed whilst this continued. In the morning, phone was on, all fine, then immediately turned itself off again. I plugged it in to charge and turned it on, "optimising app x of x" came up again. I then left for work, phone was fine, used it for a bit, pressed the power button to dim the screen, took it out again 10 mins later and it was off! Anyway, I continued trying to turn it on, it kept flashing the google logo and occasionally the 4 little globules of colour. I was fed up so held the power button for about 20 seconds, still nothing happened. I continued trying to turn it on, and i got the android guy lying on his back with some 1980s style text below! It turned on after this. I googled and I think its bootloader mode? But how was this possible when I didnt follow the steps for it? All I remember doing last night which MAY have caused it is i tried to screenshot but it failed so I ended up holding volume down and power for a while. Anyway, I have now realised whenever I press the power button to dim the screen, it turns the phone off completely. Not sure what to do?! Help please! Am outside of warranty now Sorry for the long message guys, just thought I'd give some detail!
    09-04-2015 04:47 AM
  3. MaxHaenen's Avatar
    I've got the same problem,
    But over here it won't just reboot sometimes, it wont stop rebooting & optimizing the apps...
    So I can't factory reset it.

    I'm using my OnePlus One, wich isn't the most common phone I guess...

    I hope someone can help me with this... because the phone is useless now...

    btw i'm not used to ''playing'' with my phone or computers so please tell me in ''normal'' English
    09-05-2015 05:27 AM
  4. Mont3000's Avatar
    I found this thread because it started happening to me yesterday or maybe the day before. In fact its optimizing now. The most time it happens is when im watching a movie through Chromecast but never. had this trouble. Only thing major I downloaded was a lot of live wallpapers. The first time it happened I just thought my phone was updating because I noticed when I did a conference call I now see "manage conference" option, finally.
    09-06-2015 10:35 AM
  5. jpdaballa's Avatar
    My phone started doing this a couple days ago. I turned off ambient display and it stopped doing it as often but it still does it. I uninstalled textra and reinstalled it and it hasn't done it since.

    Posted via the Android Central App
    09-08-2015 02:12 AM
  6. jpdaballa's Avatar
    I got rid of the Google news and weather widget. Disabled it and my phone stopped rebooting.

    Posted via the Android Central App
    09-10-2015 07:20 PM
  7. gbrands11's Avatar
    In my case it was the power button that became "gunked" up. I stumbled on this find when my phone restarted for the who knows how many times, and I just started hitting it on my desk. I was hitting it with the phone turned sideways (horizontally perpendicular) and the power button facing down toward the edge of the desk. I did this a few times, started my phone back and haven't had a problem since. I didn't wipe any caches, no factory reset, kept the original battery, uninstall any apps. I just knocked it around a bit.

    A few weeks later, I had the opportunity to verify this problem as my wife's phone started exhibiting the same behavior. I did the same thing to her phone, albeit a bit more controlled, and now her phone is functioning as expected again too.
    09-21-2015 05:14 PM
  8. adavzlr's Avatar
    So I've been facing this problem during all weekend, and I'm just about to call my Nexus 5 officially dead.

    Same symptoms as others. I installed Android 5.1.1 a few days back. The phone started to reboot once and again. Since I had the "lock button issue" before, I knew this time wasn't the same thing. The system starts and tries to optimize the apps due an abnormal shutdown. After trying to optimize 80,120, or any random number of apps, it restarts again in an endless loop.

    I have tried all: I wiped the cache partition, once and again. I tried to go back flashing to a previous android version. Didn't work. I tried installing cyanogen mod, and still facing the same issue.

    I'm not sure if replacing the battery will do the trick, but I suspect another kind of hardware damage in my device.

    If anyone has the same issues as mine, drop me a message and let's see if we can came up with a solution.

    09-29-2015 04:33 PM
  9. adavzlr's Avatar
    Quck update:

    I removed the SIM tray and was able to do some progress. The system now boots into Android, but the applications are still failing. Can someone try the same?
    09-29-2015 05:15 PM
  10. TheMisterBadger's Avatar
    I got the same problem since today.
    I accidentally dropped my phone, and the battery flew out. After i put it back in it started the optimizing in an endless loop.
    when i just let it run, it randomly starts over before its finished.
    But when i play with the volume keys to keep it from standby (i think) it seems to finish and start up my phone.
    after a certain time tho, it crashes again. and i either have to force restart or it reboots on itself. and the entire optimizing thing starts all over again!

    I got an LG G4s (2/3 months old)
    I dont think its due to an app on my phone, its more like a mix up in hardware after the fall.

    Can i fix this?
    12-15-2015 03:58 PM
  11. waseemhrifai's Avatar
    i have the same problem with my phone (LG G4 H815 global). it is restarting alone time by time and it couldn't turn on. however it shows me that the phone doing optimizing but it couldn't finished it...how can i solve this problem without loosing any data.
    12-31-2015 07:54 AM
  12. marc defranco's Avatar
    Happening to my LG G Stylo as well. If it does turn on when I press the power button I typically have 3-15 seconds before it either shuts off or continuously reboots over and over again. Factory reset the phone and its still persisting. 2 month old phone pretty much bricked.
    01-15-2016 06:54 AM
  13. RobertoSolone's Avatar
    I also have the same problem with my phone LG G4 H815, only 5 months old, please let me know how you fixed it!
    01-18-2016 04:17 PM
  14. maclancer's Avatar
    Happening to my LG G Stylo as well. If it does turn on when I press the power button I typically have 3-15 seconds before it either shuts off or continuously reboots over and over again. Factory reset the phone and its still persisting. 2 month old phone pretty much bricked.
    Have you tried replacing the battery and try again?
    01-18-2016 04:40 PM
  15. pete1118's Avatar
    I am 99.9% sure it was my case causing the power button to stick on my N6. I took the case apart and cleaned the button really well, then made sure I had it on correctly and it stopped my problem over 4 months ago. I have since sold the N6 and the new owner (a friend) has not had the problem either. I hope this helps and of course if you don't have a case on yours, well good luck in getting it working again!
    01-18-2016 05:47 PM
  16. EPiK Avid Gamer's Avatar
    Did you prefer to install apps in the external storage? Because I found out that the cause was that I was installing apps in my external storage...So I installed them in my internal storage and guess what? It worked! I have no clue why it fixed the problem... Good luck though
    01-26-2016 09:01 AM
  17. TimurY's Avatar
    I found a solution which helped me to solve this problem.
    my Note 4 was consantly rebooding saying "Android is Starting... Optimizing app # of #" while the phone was getting very warm.

    so i put it on cold stone surface letting it cool done while doing this operation. And surprisingly it helped!!!
    it was my last hope before resenting and erasing everything.
    02-01-2016 11:50 AM
  18. Victor Dulepov's Avatar
    My CAT S40 does exactly the same - self turn-off in the pocket, get heated like crazy, and then start optimizing the apps at startup for some 20 minutes or more before it becomes usable again. Definitely a 5.1 issue (the device came with 5.1 preinstalled, so the issue is NOT a result of an upgrade and NOT device-specific and NOT operator-specific).
    05-25-2016 11:32 AM
  19. jatinderpal's Avatar
    Plz help for my nexus 7 to get out
    06-02-2016 11:27 AM
  20. jonap castro's Avatar
    hello what should i do my phone nexus 4 version 5.1. after booting my phone always show optimizing application then i wait too long ... it always happen when i reboot my phone...pls help me.. pls give some tips to avoid this problem ...
    07-18-2016 04:28 AM
  21. Shantrell Simmons's Avatar
    09-06-2016 12:41 AM
  22. I_am_griffinpapi's Avatar
    I tried updating my WhatsApp messenger and immediately it got installed,my phone rebooted itself and began optimizing apps, afterwards it reboots again and continues the same process over and over again,what should I do
    04-14-2018 11:07 AM
  23. asylum23's Avatar
    If you have Zedge, this is what is causing it.
    I had also done other updates and thought it was Android System WebView as it started right after that had updated. Then I read it's Zedge and I've had that program for almost 2 years. I had restarted phone and was again stuck on "Optimizing", but for me each time it has been a good 20 minutes.
    I uninstalled Zedge and it started right up, no Optimizing. Thanks for everyone who figured this out!
    05-01-2018 06:37 PM
  24. Elgoretto's Avatar
    Hi everyone.
    Same problem with LG G4 and 3 apps.
    One was Zegde as mentionned above.
    Two other ones were Deezer (confirmed by their support) and Facebook messenger.

    Took a while to find them but now everything is OK.
    06-07-2018 04:12 PM
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