I bought a Roborock S6 Pure after Christmas. This is my 4th Roborock/Xiaomi Vacuum so I’m pretty familiar with the app and how they operate. My S6 seems to go on the dock fine but doesn’t charge. The next day it is off-line. If I. Manually put it back on the charger I have to move it around to get it to charge again and the next day it is offline. I have put the charger on carpet and hardwood floor and it never seems to line itself up correctly to charge. Is my unit defective? It isnt the app. It just won’t go on the base properly. I have cleaned the base and everything.