Hi Proton and welcome to the forum.

The 861 power supply does seem to be a weak point and you do seem to have been particularly unlucky. It could be that your distributor had a dodgy batch of replacements. Hopefully if you have the latest PSU it will be trouble free.

I don't have any direct experience of this, but I'm sure others who do will add to this thread.

Roon Developer and ex-moderator of this Forum
I am #25 in the HH1 photo of fame.