Im upping this post again because the sudden crash/booting continued after a while ...
Could it be that the PSU im using is giving all the trouble?
I used an old A500 PSU and the a600 crashed all the time.
(Allthough the heavyweight A500 PSU should be better than the flimsy original A600 lightwight PSU)
Then I changed it back to the original lightwight A600 PSU and ran a game 10 hours straight without any probs.
Think you answered your own question there...

@ Gertsy
Dunno, there's a big virus that live's at the bottom of me garden and it's huge, got 18 fingers like baseball bats, but I don't think it's clever enough to reset a miggy, all it ever says is Ugh and Bongo's...
