iPhone 4 freezing/locking up at "Slide To Answer" screen, vibrates but doesn't ring?
When I receive a call, my ringtone does not play but the phone vibrates as normal. In addition, The "Slide To Unlock" screen freezes and I'm unable to answer the call and eventually the caller hangs up/gets sent to voicemail. This is happening for 90% of the calls I get, pretty frustrating.
Occasionally, I'm able to answer a call if I repeatedly slide the slider across the screen, and it will eventually answer. This is good, but what's the use if I can't even hear my phone ring?
I've tried powering the phone off/on and a soft reset, but neither really helped.
Anyone have a solution?
iPhone 4, iOS 4