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.
Sounds very much like a damaged PSU to me.
There's several symptoms that can be related to weak or damaged PSU. Intermittent reboots is one of them. Internal HDD spindown/up is another. I even had the mousepointer get corrupted during high powerdrawn on my old A1200 with BPPC040 and BVision.
