Sounds like the problem is the shower drain. It may be partially obstructed forcing the sink water up into the shower. You might try pushing a wire coat hanger down the shower drain and see if you hit something. If there is something hard, there is an access hole with a cover on the front of the shower pan. Just remove the two screws and take a look at the drain. If the drain needs to come off, it’s probably time to go back to the dealer. Good luck, let’s us know what you find.
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