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If it's a VM based changer (most makes rebadged VMs at some point) sometimes a very small lever that rides on the large main sliding bar will have gummed up grease on it and not want to move and when the arm hits it there's enough resistance to make the arm skip backwards.
If the aged grease on it is the right flavor of gummy then when you finally get an arm trip for the change cycle it will get stuck in continuous change mode and not allow playback.
On those VMs I clean all the grease off with goof off, lighter fluid or brake clean and replace it with oil to achieve a lasting fix.
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