Treadmill worked fine but now the elevation does not work. It is stuck at one elevation and each time I enter a change, it goes to 40 degrees then to -3 degrees then back to 40 degrees..... The speed works fine but the calorie counter thinks it is at either 40 degrees or -3 degrees and tallies accordingly. Two things I did prior to it happening were to move it and to enable the iFit cartridge. It worked fine for about two weeks and now I can't change the elevation. I've unplugged many times to no avail.