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Are you running the printers within enclosures? I had a rather identical sounding print failure situation that resolved by moving the printer...
A follow up, as I did eventually solve my situation. My electronics are all outside the enclosure, and have their own cooling, TMC2209's were set...
I've got the same issue. Hemera xs with revo, prints will just stop printing if the print time goes over about ~3 hours. Also did a full teardown...