I recently upgraded my system from 64 bit gutsy gibbon (7.10) to hardy (8.04 LTS) via the update manager.

When it was finished and i went to boot up my new and 'improved' system.
I found that it would randomly (never at the same time, ranging anywhere from 5 minutes to more then an hour) it would just freeze/crash/hang up and nothing was use able the keyboard lights flashed and the mouse didn't move

Im currently using the restricted nvidia drivers and a rt61 wireless driver.
both these worked in 7.10 as im using that atm as i cannot upgrade to 8.04
any ideas people?
much appreciated and will give any more info if needed.