I have a similar problem with my Casio Commando but it only randomly restarts when connected to wifi.  When not connected it doesn't restart and works fine. 

Model #: C771

Build Number: C771M110

Android Version: 2.3.3

I've done factory resets and I'm still having the problem.  Googled the issue and it seems to be an issue with this build and no answer if anyone is working on a fix for this issue that so many are having.  Any assistance would be appreciated.

Larry