network problem

[Ovush]

I have a sony xperia v . I bought it last decembar but facing some problems. sometimes it does not get any network.I bought new sim card but problem remains the same. I restart my phone to get rid of it . sometime it helps some time not. If you have any suggestion for me please reply. Thanks in advance

[jaggerkieth]

Have you tried repairing your unit using PC Companion?

Or check on your settings if your Network Mode is on GSM only? In that way you can monitor if its the phone or your networks problem.

[Ovush]

No , I haven't

and i checked my network settings. it's LTE (prefered)/WCDMA/GSM.
I have tried WCDMA(prefered)/GSM but problem is same.