OK, there have been other threads about strange WiFi behavior, especially disconnections. But they are all about when USING the phone. I have not experienced that.
BUT.... I have been experiencing pretty consistent disconnecting after the phone has been sleeping (unused) for a while. I pick up the phone after an hour and it is no longer connected to WiFi, it talks to 3G for a moment, then suddenly realizes there is WiFi and reconnects. I didn't want to post anything until I was sure this was not a fluke. This is not good, because it means any background data will be going through 3G instead of WiFi, which is much more battery usage. It also is much slower. It also means you cannot connect to your sleeping device across the network. And, it is also very annoying to have to wait for it to connect again when you want to do something quickly.
* It is not a fluke- it has been doing it day after day.
* It does it at home and at work.
* It does it even if the phone has not moved more than a few feet from the access point.
* I use Linksys WRT54G routers running Tomato Toastman at home and work. WEP at home, no WiFi security at work.
* The default setting of "Keep W-iFi on during sleep" is active (set to "always") and I have never changed it.
* All WiFi settings are set to stock/defaults.
* There doesn't seem to be a magic amount of time in sleep before it does this.
* Never had the problem on my Evo 3D, Evo OG, or Xoom, and using them in the exact same way with same access points.
UPDATE: Many users have confirmed this happens. Has been reported to HTC and they reluctantly confirm it does this but offer no solid explanation as to why.
UPDATE 2: As can be seen in postings below, there WAS an app that fixes the problem called HTC Smart Sync Disabler.
UPDATE 3 (Jan 2012): I don't seem to have this problem in Jellybean, but I also have Power Saver and Connections Optimizer off. FYI- the "HTC Smart Sync Disabler" app has disappeared completely off Google Play
BUT.... I have been experiencing pretty consistent disconnecting after the phone has been sleeping (unused) for a while. I pick up the phone after an hour and it is no longer connected to WiFi, it talks to 3G for a moment, then suddenly realizes there is WiFi and reconnects. I didn't want to post anything until I was sure this was not a fluke. This is not good, because it means any background data will be going through 3G instead of WiFi, which is much more battery usage. It also is much slower. It also means you cannot connect to your sleeping device across the network. And, it is also very annoying to have to wait for it to connect again when you want to do something quickly.
* It is not a fluke- it has been doing it day after day.
* It does it at home and at work.
* It does it even if the phone has not moved more than a few feet from the access point.
* I use Linksys WRT54G routers running Tomato Toastman at home and work. WEP at home, no WiFi security at work.
* The default setting of "Keep W-iFi on during sleep" is active (set to "always") and I have never changed it.
* All WiFi settings are set to stock/defaults.
* There doesn't seem to be a magic amount of time in sleep before it does this.
* Never had the problem on my Evo 3D, Evo OG, or Xoom, and using them in the exact same way with same access points.
UPDATE: Many users have confirmed this happens. Has been reported to HTC and they reluctantly confirm it does this but offer no solid explanation as to why.
UPDATE 2: As can be seen in postings below, there WAS an app that fixes the problem called HTC Smart Sync Disabler.
UPDATE 3 (Jan 2012): I don't seem to have this problem in Jellybean, but I also have Power Saver and Connections Optimizer off. FYI- the "HTC Smart Sync Disabler" app has disappeared completely off Google Play
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