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I got a problem with my Samsung Galaxy S2 I9100.
I have it for round about 8 monthts now and experimented with some custom roms. I installed cynogenmod 9, 10, 10.1 tested Syah Kernel and installed AOKP in DualBoot and so on.
Everything was fine until I installed CM10.1 as single boot.
There my phone started to turn off randomly and I thought that it would be a software mistake and reinstalled the Samsung stock rom. But the problem is still existing.
I dont use a firewall or antivirus program and did not checked up anything.
Can you help me with this issue or tell me how I should start detecting or solving the problem?
Thanks for your help!

I installed awg Antivirus and scanned my phone. Beside SWFPlayer there was no app which is "dangerous". And my "marked" settings were "Enable Debugging", "Allow Third Party Apps".

Edit 2:
I now updated my phone via Kies to Android 4.1.2 but the problem still exists.

Edit 3:
I think I got the problem. I already wrote it in my last comment. The batterie infalted and I think that's the problem. I ordered a new batterie and hope that's it. If not I don't know what it might be...

share|improve this question
See our chat protocol -- it's not your phone, but CM10.1 – Izzy Mar 1 '13 at 21:04
I do not use CM 10.1 anymore. I reinstalled newest stock rom from Samsung. – j0chn Mar 1 '13 at 21:59
Just to clearify: The problem started with CM10.1, but even persisted after you flashed to stock? – Izzy Mar 2 '13 at 1:09
Yes thtat is correct! – j0chn Mar 2 '13 at 6:40
Do you still use the dual boot kernel after flashing a stock rom? Try flashing the stock kernel also and check if it helps – forums Mar 2 '13 at 9:59

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