RS250 cutting out

Hi, I’ve started getting a problem with my RS250. When playing from Qobuz connect, the internal hard drive or my RSA780 CD player, the output will cut after about a minute in to the song.
You see the VU meters fall to zero. Usually, you can select anouther track and go again but it will fail about a minute in again. Sometimes after half an hour of this, it may right itself and not cause a problem but it’s making it unusable.
So far, I have deleted and rescanned the database for the HDD and yesterday I went for a complete factory reset of the box. - I did think that it was working today as I actually got three songs in before it cut out again. It’s not had heavy use from new about three years ago.

And you’re out of warranty.
Definitely something isn’t right…