That was the same thing my Beogram 8002 did at some point.
Push play and it goes to start and back again. If pushing play a few times more it would play normaly. In the end it started to skate across the records so that was it as far as using it.
The cure? Dillen fixed it. Caps, adjusments, soldering etc. CPU's one these Beograms seldom goes wrong and must be a sort of standard B&O shop lingo for a reasonable logic why we can't fix this solution. Sad but true. They can't blame it on the tacho disc either.
It still plays great 7 months later with no faults.