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Sorry, scratch the slowing down suggestion - don't go changing crystals just for troubleshooting! I thought there was a software way of adjusting the clock speed, but it's only on some ACA boards.
Yep, games will have a lot of their code in fast RAM as well when that's present, so you're using less chip RAM, and using it less frequently too, so it probably takes more time to hit a bad patch.
Swapping out the RAM might improve things if the RAM is marginal, but it's hard to know really. I'm undecided about sockets - on the one hand, it makes things simpler if it needs more shuffling of RAM chips, but on the other hand, sockets can introduce other variables and problems into the mix.
To me this feels like the machine is tripping over on the fine timings involved in CPU transfers to chip RAM, but it's impossible to dell without a more detailed look.
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