Thats odd, before i updated to kikat i was using the Owl project rom by Jdevs as a daily driver and i faced no such issues in the 4-5 months of use
I did have this problem once but that was because my phone fell down and sim card moved ever so slightly from it's mean postion. So after re-inserting the sim card, I rebooted the phone and it worked fine.
Try and do a clean install by wiping everything. Try the rom mentioned above. If that does not help i fear you may have damaged one of the tiny pins which read the sim card!
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