||I've seen that with home units. Plastic sprocket in the carriage assembly has lost a tooth or two due to age. Logic thinks cassette is being inserted - comes up, encounters missing tooth, so it reverses sending carriage back down and goes to "play".
STANDARD RIDE-ALONG BRIEF:
Get In, Strap In, Shut the F*ck Up, and Don't Touch Nothing ! ! !
"The central belief of every moron is that he is the victim of a
mysterious conspiracy against his common rights." - H. L. Mencken
"I may not know much, but I know the difference between chicken shit
and chicken salad." - Lyndon Johnson 36th U.S. President