Same for me. I did a soft reset (infotainment) for a different reason, and the problem temporarily cleared up, but soon returned. I'll give the end-routing / restart-routing trick a try, as suggested above.
Crazy question: My used (new to me) R1T came with a manual tonneau cover but no bag. I really need a bag. If you can't sell the manual cover + bag - let me know if you know if your're interested in selling just the bag.