I got a new Xperia L in August that has caused me no end of problems since I did.
The Phone kept restarting of its own accord without warning and would often be very "laggy" afterwards.
I tried removing the SIM, memory card and battery.
When none of this helped, I backed up my phone and did a factory reset. This seemed to help for a couple of days but soon found the exact same problem reappearing.
Since the latest update of the Sony "Diagnostics" app I can now see the number of time the phone restarts and also what app seems to be causing the problem (screenshots below). It appears to be the problem of Sony's very own "Phone" app that s continuously crashing and it might be what is causing my phone to restart.
Any help really would be much appreciated. Thanks 
I dont know why the screenshots aren't showing, they did yesterday, but I'll try again...
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