I've just had to take the battery out of my phone as it completely froze. Now I've turned it on and I type my passcode in and it freezes for about 10-15 seconds. It then eventually goes to the start screen and after another 10-15 seconds it switches off. Then the phone kicks back into life. And the cycle continues.
I've tried turning it off manually and it turns it self back on despite being no charger plugged in!! Any ideas? It's a relatively new phone, only had it for about 4 months