Hi Gunnar My question is if the slowing down is sometimes for a second or slowing down for longer time. first case from my experience there is a problem with the spark snubber diodes (TVS diodes) in the motor. Find out detailed information here: https://beolover.blogspot.com/2021/12/Beogram-4002-dc-motor-spark-snubber-replacement.html second case  from my experience are the dryed out motor bearings. Detailed information here: https://beolover.blogspot.com/2023/11/beogram-4002-dc-platter-motor-restoration.html and here: https://beolover.blogspot.com/2021/10/beoparts-dc-motor-bearings-tested.html   Kind regards Christian

It slows down for a continuous time. Usually I have to turn it off and leave it off for it to even change back to normal. I will check out the links and see if I can get it figured out thank you!

You don't state if your deck is a DC- or AC-motor version, but in general: Dry motor bearings (if never replaced it's time now). Bad speed relay (if never replaced it's time now). Bad speed trimmers (if never replaced it's time now). Bad contact in speed fingerwheel-trimmers (clean them anyways). Cracked solder joints at PCB connectors (later decks only), particularly the one for the speed dial panel. Bad TVS diodes in motor (not that common but it does happen. AC-motors don't have them). Any combination of the above. Martin