We have an MKE 17 MLS (love it). We put in a dvd and used the flat 2”x3” remote and it worked perfectly. Next time we went to watch a movie the remote did not work. Oh well, we thought, get a new battery although used once in a year. So picked up a battery (2025) flat. Still won’t work. Did i do something to a setting from stopping it from working? Or is it defective?