Hey guys, I have a problem I need help with an issue I have with my new computer. It has a tendency to just randomly crash and reboot itself. I think it crashes, because the screen that asks if you want to run in Safe Mode pops up every time as I cut it back on. I don't know what would be causing this, and I have called the manufacturer about it, and the guy didn't really help >.< What could be causng this? Could I have a faulty power supply? I don't think its a heat issue,however, because I have a program that tracks my core temperature downloaded, and all my cores stay at around 30-45 Degrees C, depending on what I'm doing at that moment. Any tips would be appreciated, thanks!

Computer Specs:
AMD FX-4100 Quad-Core Processor, 3.6 GHz
8G DDR3 RAM
Nvidia GT 520 Video Card
500 Watt Power Supply
(these are the only relevent specs to my problem, I do believe)