Screen goes back to home screen frequently, after Data Network enable When I enable Data Network, my phone goes back to home screen frequently whenever I use another application or go to another place. Even when I close my screen, my home screen appears. How to fix this error? When i deactivate the data network mode, the phone works normally.. please please please update me the solution on it.

My phone is Samsung Galaxy S plus.
Model Number - GT-I9001
Firmware version - 2.3.6
Same phone. Never had this happen to me.
Using a custom ROM though. BroodROM Business Edition.
I would recommend upgrading your system or flashing a custom ROM.