Hey all, please advise. I'm having troubles with my a1200 lately. Problems started a few months ago, with random crashes while playing 3D games that use the PPC processor. Amazingly, half a year ago I could play games like Quake and H2 for hours without a single crash. (not that I did, since Q1 is rather boring and H2 runs like sh*t, but nice stresstests, no? 
Ok, my first question would be, what's changed?
You say this behaviour started a few months ago, did you add or remove something a few months ago in terms either of hardware or software?