The problem has been around for a few months, but has got alot more frequent in the last few weeks.
The phone is running XWKI4, Kernel 184.108.40.206.
Does anyone know what might be causing this, and whether there is a fix?
My wife has an S2 with stock ROM. It's unlocked, on a T-Mobile UK SIM. The phone is about 6 months old. There is a problem with the phone screen going blank and not responding to any button or screen presses when dialling a call. After 10-20 secs, sometimes longer, the phone starts responding again.