Clock lurch and input lockups and a stopped transient scroller could all have a common cause. Perhaps interrupts are being masked and not being correctly unmasked somewhere under certain conditions? Or the player is waiting for a short-term event with interrupts masked and the event occasionally actually takes 20 minutes to happen? (I'm thinking of things like off-chip communication here.)
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Toby Speight
030103016 (80GB Mk2a, blue)
030102806 (0GB Mk2a, blue)