BB Torch :: Frequent, But Random Reboots?

I recently acquired a Torch 9810, originally from Rogers but MEP2 unlocked and running on Fido with a 6GB data plan. It's my first BB, a choice that I made specifically because I was so impressed by my Playbook. There is, however, one thoroughly frustrating problem, which is that it suffers from random reboots. Symptomatically, there is a brief pause, followed by the backlight turning off (I can still see the previous content on the screen sometimes), followed by the red LED and then the BB logo with the loading bar. It looks similar to a soft reset or battery pull. These reboots seem to be completely random:
1) They take place over a wide range of activities, including web browsing, email reading and composing, Facebook, Twitter, built-in apps, even when looking through settings menus.2) The frequency seems to be random too, sometimes I can go for half a day without a reboot, but sometimes the phone will reboot twice in the span of a few minutes.

I tried reloading the stock Rogers 7.0.0.254 OS but this did not solve the problem.Thereafter, I have gone through 3 different 7.1 OS versions, each time using BBSAK to wipe my device to a 507 state. I have tried Telus 7.1.0.267, Mobilicity 7.1.0.378 and even the latest official OS for my phone, Rogers 7.1.0.391. I'm not sure that my apps are contributing to the problem since I have the problem after a wipe, but I have the following installed:BB ProtectBB BridgeBB MapsBB 5 soundsFacebookTwitterWindows LiveMessengerYahoo MessengerGoogle TalkWikitudeWord MoleBrickbreakerGoogle Maps There seems to be plenty of free storage space, over 180MB right now.