I have similar experience.
My suggestion.
1. Can it be related to bad tubes ? Tubes is likely to have slight DC offset higher than SS gears and when tubes gone bad it can get worse I dunno.
2. Moon amplifier shut down in a similar way when I try to play my old Sony CDP X77ES on RCA, but it didnt
Happen when run XLR,also this happened when I liked to have some fun connecting my first ever surr processor
The Yamaha DSP-1 to my current system, the amplifier shut down. This means sometimes the DC leak is from source and can reach power amp. Old source with bad capacitors can do this.
Toga.
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