I have a 2013 Big Horn 3010 RE with the six point Level Up system. Recently I did a recalibration of the unit(zero setting of the control) as it was not levelling to our expectations. Since this procedure was performed( sucessfully) I haven't been able to use the return to drop off level feature. When I press the left and right buttons together on the control unit, an error message comes up saying that this feature is disabled. Because of the fact that it worked fine before I did the zero setting I'm assuming it was something that I did in the process... Any one have any experience with this.