Ps2 random crashes :(

[Fu-Qua]

hi !

i got a huge problem with my ps2, it randomly locks up while
playing rpg games (xenosage, dark cloud, FFX) this is really
****ed up. i got a newer type ps2, with a clone messiah chip
in it. anyone knows what the problem could be ??

most of the time it crashes when its loading something. but
sometimes it also crashes just during the game !?

if u need more info on this plz let me know.


ps. anyone how i open the case of the damn ps2 ?