screen freezing upon incoming calls - help, please!
Intermittently, my iPhone gives me a massive problem. When the phone rings, the screen goes completely black and is unresponsive to touch. I can get back on again by simultaneously pressing the square button at the bottom and the top silver button, but this is very inconvenient. However this doesn't happen every time i receive a call so it is difficult for me to show any shop assistants. Is it a hardware malfunction? I have updated all the latest iPhone settings through iTunes.
What can I do to solve this problem?
Thanks.
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