Wierd ps2 problem

[Nightfall Z]

Hey guys something wierd happened to my ps2 while i was playing it. Well i was playing Xenosaga and all of a sudden the ps2 shut off on its own. I was worried for a while so i just turned everything off and gave my unit a break for like 5 mins. When i came back it booted right up. And i havent had this problem again. Im still concerend about the ps2 though. Anyone got any idea what might be the problem. I do have a WHOLE bunch of dust in my room because my rooms located near the laundry room and most of the dust come from there, because of the dryer. So i was thinking maybe i need to take my ps2 apart and clean it a lil or i may need another ps2 fans. If anyone else has an idea what might be the problem could u please let me know. Thanks.