Thanks, I'm quite new to this forum as well
I think the rom I used was SGS2_XX_OXA_LPH-v5.2-CWM5
I've looked into it a bit further and this thread seems to pretty accurately describe the symptoms of my phone, unfortunately I don't have the technical know-how to properly follow the instructions
http://forum.xda-developers.com/showthread.php?t=1611796