Or, the other possibility is a Micro Switch that is hanging up, or perhaps has gotten a bit of oxidation on it?
Just Saturday, I cured the nagging ongoing problem on my own CAL Audio Delta Transport, in which the Drawer would close instantly after opening it (Either with front Panel Switch, or Remote)
It had first been suggested here, that it may have been a bad Belt. That didn't cure the problem.
Later, in another group, it was suggested it may be either a Microswitch, or worse, the IC Logic.
It was the two Microswitches!
The Two little Paddle Micro Switches on my Unit were under the Drawer, and almost impossible to see, being camoflaged black, the same color as the rest of the Drawer Carriage, and Drawer. Once I found them, I gave them both a small shot of DeOxIt Cleaner/Lube.
I had previously replaced my small Belt, but this was not the fix. Your Belt may be fine, but you may also be getting slippage? Clean both Pulleys with Alcohol, and you might even get lucky just using a Rubber Rejuvenator on your Belt, such as used on Reel to Reel Rubber Pinch Rollers.
Lastly, this could also be a Front Panel Switch, and again, the use of DeOxIt here may also bail you out.
(If it also does this with the remote, then you more than likely know it isn't a faceplate mounted switch.)
Hope this helps you, and let us know how this all turns out. Mark