Has there been a firmware update recently?
Maybe this will help:
1. clear the cache first.
2. Then close the DreameHomeApp
3. then switch off the robot with the start/stop button (hold it pressed for approx. 3 seconds)
4. then pull out the power plug of the base station
5. wait approx. 3 min.
6 . plug the base station's power plug back in
7. switch the robot back on
8. start the DreameHomeApp again
9. click on the robot in the DreameHomeApp
10. Now your plug-IN should update again.
11. Done