Mine does that once in a while.
If I hit the button up then down it often goes.
Once it had lost it's programming and though it was as far down as it needed to be. Reprogramming solved that permanently.
Another time the house batteries were low, well below 12 volts. Darned drivers shade was the only thing that didn't work. Plugging in solved that.
Jim and Carol, plus furrballs Riley, Nikko, and Kobi
2017 Entegra Aspire, 2008 Monaco Knight, 2000 Fleetwood Pace Arrow