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what connections do you use for the device you are listening to, and what device are you listening to when this happens. you should use either an analog, or a digital connection to a device, but not both
problem is oxidation...Remove and clean the ends of cables with sandpaper slowly...there is slim and flat cable into the reciver (together with five cable)...specially remove it's socket and clean it...
There are poor solder connections at the output amp pacs and the voltage regulators. Once these are resoldered the problem should go away. If you can solder, resolder any connections that appear grainy or have rings. If you can not, this should be effectively a labor only repair for any shop that works on audio gear.
The most likely culprit here is the output protection relay. The contacts are a little corroded and the higher volume "jumps the gap" temporarily "cleaning" the contacts. The relay should be changed. I don't have the manual with me, but the following relays are in the unit. One of them is the speaker relay:
sounds like the speaker protection relay is operating probably from a dc condition appearing on power amplifiers outputs. probable cause is dry solder joints to the output stages. will need some reworking of the PA stage soldering to fix.