hd4870 driver problem

sometimes if i play games, maybe i play 1h, my ati driver keeps restarting i mean ati driver can recover himself but its very stuped if i play game and if i try frag someone my screen turn's off for 4 sec and after that i get pwned :(

hmm, make sure u got the latest drivers. if u do try reinstalling.

frag someone?

Like 21DD23 said, then upgrade ur video card drivers to the latest:

http://ati.amd.com/support/driver.html

And if that doesnt work then uninstall and reinstall ur drivers.