phone application is unstable. Iphone 5s, SW IOS from 7 till 8.1.3
the phone application is unstable:
- when i receive a call, it rings 2 times, then it stops. i cannot find the caller name in the phone list.
- i cannot make calls, the radio signal is varying, sometimes it is searching the carrier network
- another person calling me, hears my phone ringing and i am not answering. Actually i hear only 2 rings, if i am close to the phone then i see his number/name, otherwise later on i cannot find who was calling.
Once it gets to this state, there is no way out than restart the phone. Then it happens again after a few hours, 1 day.
I attache here some memory consumption screenshots.
any idea how to fix this wrong behavior? resetting is not a solution on long term.
iPhone 5s, iOS 8.1.3, all IOS versions from 7 till 8.1.3