saturn crashes maybe overheating problem

just aquired yet another sega saturn to add to the other 4 i own prob is its booting games fine at 1st but after awhile it crashes or if you turn a game off after so long and try another game the video stutters or crashes even the sega saturn boot screen aswell yet you can still hear the audio running fine in the background.any help much would be much appreciated
 
Can you still boot/run a game after video has "crashed"?

Does the video look like the data itself is scrambled/corrupted or is it more like a bad TV signal?
 
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