EUFY RoboVac X8 hybrid error S1

[tehmatix]

I have this cleaning/moping robot working fine for 7~8 months with not any problems. Now its coming with "error S1" and I don't know what to do.
What I done since now is to check the battery which is ok, I replaced it with other battery and its doing same thing, I checked to see if anything is stuck or block, I did a hardware reset and connecting back to my wifi.

[CapLeaker]

I think an error S1 is related anything to charging, not only the battery. By that I mean it includes the adapter, the charging base and the metal connections between the base and the robot itself.

[tehmatix]

It's doing that even without charging base, and the battery is fully charged. I will check again the power adapter.
Can you tell what is doing the micro-usb port next to the battery?