My new Dreametech L10s Ultra has been great so far and it does fine on my main floor (with the base station) and in my basement. But when I take it to my 2nd floor, it positions correctly and says "start cleaning", but then it spins once and says "please return robot to the base station". It already successfully mapped the 2nd floor.

Has anyone experienced this? Why does it sense where it is and begin cleaning, but then immediately stop and need the base station? It's done it numerous times. The battery is fully charged, the mop pads are cleaned and dried.

Thanks for any assistance or ideas.