Keep losing the signal while call is running

Dears,
my problem is in my new phone Z3 Dual, every thing in the phone is good and running properly but i noticed one problem recently.
when i receive calls or starting calls, some time the signal is suddenly lost and call broke and i lose the phone call then it works again.
my sim is nano sim and works just fine.
kindly advise

This is what I would do @samer711
1. contact your carrier/network and ask for any network coverage issues
2. get a brand new NANO SIM card, don't get a regular SIM card and cut it
3. repair the phone with PCC or Bridge
4. DO NOT install any antivirus or taskillers or battery apps, sweepers etc. 
PC Companion (PCC)
Bridge (for Mac)
Alternatives on How to backup Xperias
http://talk.sonymobile.com/thread/36355
"I'd rather be hated for who I am, than loved for who I am not." Kurt Cobain (1967-1994)

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