I wanted to give you all an update on my end. I tried turning off some of the apps in background app refresh but I was still getting a lock up in the evenings. I then completely turned off background app refresh and so far I have not yet had a lock-up (it's been three evenings so far). My guess is that it is one of the apps but I haven't had the time to figure out which one (it is not possible to predict when the lock up will happen other than the fact that it was happening every evening).
My guess, again, is that there are several bugs being reported in this thread. Some sound like real hardware problems, while others sound like problems with software (e.g., the app refresh thing), or a third option might be problem hardware whose problem was triggered only by the new software(ios7).
In case it helps anyone, the apps I had in my background app refresh list (which again are turned off now), were:
ShazamRED, Bing, Cards, Chase, Evernote, Google Maps, NYTimes, Pulse, Reminders, Runmeter,
Running, Stocks, Toodledo, Urbanspoon, Weather, and Weather!
jbapple444 wrote:
Yes. It seems there are multiple possibly unrelated issues people are discussing in this thread, but the problem both you and I (and a few others here) are having seems to be identical.
Pdougie wrote:
Interesting. It only happens in the evening for me also. It always freezes at some point between the unlock swipe and entering the first digit or two of my pass code. This definitely seems like a software issue. It seems stupid to replace the whole phone over this.