Paul from SWISCO responded:
April 22, 2015
Something sounds like it could be out of square, either your jamb or your door. Hopefully you can solve the problem by adjusting the wheels; you can do this by raising the wheel at the handle side and lowering the opposite wheel. Also, your track might have sagged near the jamb that the runner has worn down. You can fix this by adding a track cover like our 80-102.
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