Ok so I had to deal with this issue for a long time. I had 3 of these phones all the same with the exception that one was an earlier model that had 32g of space instead of 8 or 16. I kept resetting the phone and the wifi and bluetooth would work for a very short time and then stop again. This problem only happened on the 32g version and so after months of uninstalling and reinstalling apps and resetting time and time again I decided since what I was doing was what most people considered the very definition of insanity I decided to give up. I pulled out a windows phone that a friend had given me and started using that. After a few months of using the Windows phone that hardware wise sounded awesome but because Windows 10 mobile is a ******* ****ty mobile OS (IMO...at least at the time of me writing this) I was sitting at starbucks one day watching peoples traffic and surfing the web. Previously when I had looked into why this was happening noone really had a reason but I guess that with time more and more people experienced this and as of today there is a couple of pages of people trying, some succeeding and some failing, to get the wifi and bluetooth functionality back. One said flashlight app, another said cvs app...so I basically uninstalled all the apps I could and restarted the phone....NO CHANGE. After sitting the thinking for a minute I decided that I was going to try to reset the phone one more time and after that if it did not work I was going to throw it in the damn trash. Well, I did a hard reset and as the phone came back up I saw the list of access points around me show up. YAY! But how long would it last? I signed in with my google account and let the phone pull my last backup from google and install all the apps that I last had on it. I noticed shortly after it finished that POOF...my wifi went out again. After first hearing that it was this app or that app and not seeing any of those apps on my phone I thought well, that can't be my problem then, right? Then an idea popped into my head. What if it was an app just not one of the ones I had seen mentioned before. Since the phone was redownloading all the apps I had previously and it was always after that point that my connectivity would once again cease I thought, what would happen if I didnt let google reinstall the backed up state of my phone? I did one more reset and this time I checked the box that told google not to do a restore. BAM! BOTH BLUETOOTH AND WIFI HAVE BEEN FINE EVER SINCE. Apparently everyone saying that it is an app issue has been half correct. While it may not always be the same app there does appear to be a correlation between the connectivity issue and some application. While I would really like to know which app it is, at this point I have wasted wayyy to much time on this issue to let google reinstall my apps and try to go back through and figure it out. All I know is if you have the same issue do a full reset and DO NOT let your phone restore any kind of backups....if you dont want to do this because you will not have your contacts then either do a partial restore or just do a manual backup of those certain things you absolutely need. Please let me know if anyone tries this and it does or does not work for them.
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