Automatic Sim lock issue with ICS ROMs

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Hi there. I have tried Virtuous Quattro RC3, IceColdSandwich 5.6, 6.1, 6.2. I am facing an issue with the sim lock. After I manually lock the phone (by power button), after sometime when I try to unlock it says sim locked and asks for PIN to unlock. This happens randomly not always. Anyone else facing the issue ?

If I disable sim lock, then in that case, sometime after locking the phone, the phone network goes off. I need to search for network manually. Is there any setting that I must change in order to prevent this ?

No one ?