Push Notifications Stop Working
I'm having a problem receiving push notifications on my iPhone 5 (Verizon). This affects push email (iCloud and Exchange), iMessage, and third-party apps. Push notifications will work normally for some period of time (on average, a few hours, sometimes less) and then stop working. Toggling airplane mode or restarting the phone will restart the push notifications service and temporarily fix the problem. But it then recurs. I've tried resetting network settings and backing up & restoring the phone, but the problem recurs.
I've also noticed that the apsd process is crashing on my phone. APSD is the Apple Push Service Daemon. It seems every few hours or so, it crashes with exception EXC_CRASH (SIGABRT), and the phone stops displaying push notifications. You can see the crash logs in Settings-->General-->About-->Diagnostics & Usage-->Diagnostic & Usage Data.
I have no problems (and no similar crash logs) on my iPhone 4S (AT&T) and iPad 3rd-gen (Verizon), both of which are running iOS 6. Is anyone else having similar issues and has anyone gotten a response from Apple?
iPhone 5, iOS 6