After you have emptied all of the water from the pump trap - put unit on drain/spin cycle without adding any water and observe operation - does it spin up to high speed during this cycle ?
While you are in there, remove the stupid little catcher cup that's in the tub-to-pump hose and ditch it, only causes headaches (you might find it full of goodies causing your issue) Looks like this:
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Welcome to our new server! 06/21/2017We just completed big migration to a new server. Looks like everything is working fine. If you see any weirdness, let us know!