Squeezebox Classic /LMS 8.x - Audio stops - Strange phenomenon

Dear crowd,
my more than 15 year old SB3 (Classic) has worked like a charm, until
lately when all of a sudden it developed some problems. A year after
having upgraded to LMS 8.x it started acting up and randomly stops audio
playback (sometimes it plays for 30 mins, sometimes only for 1 min). I
thought it was dying, but here is the strange thing:

- when I synchronize it with an instance of squeezelite on my Mac ->
everything works like a charm

I am really baffled by that prob and would appreciate any hints.

I can rule out networking probs (wired - 1Gbps LAN - client stays online
and is pingable with a latency of 0.8ms max), I have exchanged the
cables as well for good measure
LMS is running on my Synology NAS (and has before) in a docker
(currently 8.4.0)
The problems do not coincide with an LMS upgrade and are not rectified
by it

Could this be a hardware problem ? (power supply ?)
Could it have something to do with the control traffic ? (since it
contiunes playing when synchronized)
Is the box finally dying ? (capacitors ?)
...

any hint is appreciated


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