Sometimes my phone reboots when I receive a call or do a call.

[DmitriyS]

I have a problem with my Sony Xperia V when I receive a call on the phone or do a call. Sometimes my phone reboots. What is the reason of this problem? Software version of my phone is 9.1.A.0.490.

[jaggerkieth]

Try to reinstall your phones SW using Sony Update Service http://www.sonymobile.com/global-en/tools/update-service/