On normal setting [and others] the display reads 58. When it goes to 55 it jumps to 1 and shuts off 60 seconds later. It will immediately restart so it's not a motor problem. I cleaned the sensor bars with sandpaper but it didn't make a difference. I think that it's the control board but I'm looking for a second opinion. Has anyone else run into this problem? I don't want to invest in a board unless I'm sure. Thanks.