HTC Desire HD Random Restart

I have a HTC Desire HD phone, I installed "Android Revolution HD" and "BlackOut Rom" to it before, I made same overclock stuff... Now my phone restarts randomly, generally while connecting mobile network, if I make it AirplaneMode and only use for wireless network connection it works (but restart sometimes too), I watched debug strings with ADB but can't find why it keeps restarting... buy the way it is not restarts when in recovery mode... So how can I understand what is wrong with my phone ? Where should I look ?, should I install a ROM from HTC to see if it is working right...