Sounds more like a bad power supply. As the supply heats up it is probably sagging. When you remove peripherals (like the SCSI board) the machine draws a bit less current and the voltage rises. Try swapping out the power supply, waiting too long when the supply is suspect is a quick way into bad HD hell as well as assorted other toasted components. (lost 3 HDs, cache ram, two CDs and a floppy drive to one saggy supply myself)
The problem gets worse the longer the computer is on. Weirdly I can mount floppies first thing in the morning, after a couple of hours, I can't.
If I take the SCSI board out the floppy works better, but not perfectly. Sometimes, perfectly good disks are rejected.
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