U64 [1.43] [3.11] When using poweroff REST method machine turns off with a very loud POP in volume

[TomCat666]

When using poweroff REST method machine turns off with a very loud spike in volume - a loud POP is being emitted on both channels, afraid it might damage something either in U64 (SIDs?) or on audio equipment. There is no such pop when holding power button for 4 seconds to power it off.

[mrdudz]

Pops here also at powerup (using the button)