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Believe me, it is overheating. The heat doesn't tranfer well from the inside to the outside. The fan on the side is vented backwards to do any good, and the design of the heat-sink on the three major chips is inadequate to competently cool them on some machines. I have even bent the heat-sinks down a bit so they press on the chips a bit harder and mine still overheats unless I turn the Dreamcast over on its side with the fan port up, and place a small desk fan beside it, blowing over the bottom of the console.
If I follow this procedure, I can usually play for a long while before eventually (sometimes never) locking up. If I don't follow this procedure, it rarely lasts 5-10 minutes before freezing. Once it starts freezing up, it won't run reliably unless it has been left turned off for several hours (at least).
Try it. The lack of perceived heat coming from the bottom of the console does not mean that the machine isn't overheating.
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