I don't actually know, but i would suspect some form of binding. I would look at all the support joints looks for dirt, ensure that they are well lubricated. I would also look for some obstruction - something it needs to "crush" to close. Could even be part of the top hat is not folding properly. or a cable frayed at the very end?
Since it eventually gets there, it cannot be the motor or limit switches, which are a common problem.
Grant
Grant
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