This problem you are facing could be due to loose sim placement inside your phone, please mention at what frequency do you face this problem, because i also used to face this problem sometimes in my Sony W950 handset, and after switching off the phone, and removing the battery, i used to take out the sim and fit it again properly and the problem used to go away.
If you face this problem specifically at some location then the problem could be with the mobile operator network there
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