iPhone crashing and restaring randomly

[iphone81]

ive had my iphone about 1 week now, unlocked with software 1.1.1 and it keeps re-starting itself completly randomly....sometimes when i answer a call, sometimes when I got to unlock my phone, and sometime when i just press the lock/unlock button on top...

can anyone tell me why? can I restore on itunes without any problem? will it lock it again? brick it?

[NetMage]

What software did you use to unlock?

Are you running SummerBoard? Do you have Dim Wallpaper turned on?