iPhone 5 timer problems

I've run in to two problems on iPhone 5: Ambiance is ignoring the 90 minute timer I set when going to sleep. I have seen the timer stall with 6 minutes remaining; I've also seen the timer completely expire, which is the more common result. In either case, Ambiance just keeps playing until I manually stop it. I have it set to exit at the end of the timer but it never happens. I have tested the timer with short times (2 mins; 5 mins) and it seems fine. I only see the problem with the long timer.

Also, after this happens, the main iPhone menu button partially stops responding: single and double taps don't respond but a long tap still brings up Siri. Ambiance is fully functional while this is happening; I just cant exit the program without shutting off the phone.
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