Unfortunately my robot has stopped working with an E:23 error code!
I've tried removing and re-attaching the batteries, then cleaning the charging base and contacts, nothing has worked so far
US support also hasn't responded.
E:23 means that there are no batteries in the robot (or that the connection is broken). Could you check the battery connectors to see if they are damaged somehow, or if any of the cables are not properly crimped to the connector? If you have a voltmeter, you could also measure the battery voltage on the two crimp terminals that are connected to the thicker red and black cables from the battery connector. (Just watch out - don't use a multimeter in current measurement mode! That will short-circuit the batteries.) The battery voltage should be around 7 to 8 V, and similar on both battery packs.
Let us know how it goes!