[tx_dbs_tx]

Sorry to inform you that flashing a stock, custom, or rooted 3.30 Rom will not fix your rebooting issue. This is an internal hardware defect of some sort and no matter how many times you flash or wipe your EVO, it will still do it. It happens when the phone is put under a load such as data usage while having weak signal, streaming flash videos, etc. My old EVO did this and got so bad I had no choice but to exchange it for a new one at the Sprint store under factory warranty.

You will soon find what I'm telling you to be true. You're going to have to exchange your EVO for a new one and hopefully it won't develope the same problem. There are several threads on this already, just search here in the forums or look over @ androidcentral.com
Good luck.