Weird loop of console freezing then not displaying av?

Okay so I have a ps2 slim 70001

It didnt read disks at all and froze up so I replaced the lens, now it reads disks and I actually played a game for almost an hour. But sometimes if I bump it near the disk tray or put a disk in the whole console freezes. Then it doesnt show any display, but if I leave it off for a minute or so, then turn it back on it works perfectly so long as I dont bump it again, but if I do then the whole thing repeats and it wont show display until I leave the system off for a minute. Anyone dealt with anything like this?