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Amiga Technical References
A4000 slows down or crashes, and boards or drives overheat.
Check that airflow isn't restricted by cables, that the fan or heatsink on the processor isn't blocked and is attached solidly to the chip, and that the fan is installed properly, so it blows hot air out the back of the power supply.
Overheating can cause seemingly unrelated problems with disk drives or expansion
boards, cause connectors to work loose, and reduce the lifespan of silicon