Your robot vacuum's sensors are probably dirty.

Yes, that’s almost always dirty sensors or a stuck bumper.

The cliff sensors on the bottom get dust and hair clinging to them, and the bumper can get jammed with debris. The vacuum’s brain gets mixed signals, so it stops, reverses, and tries again. Same thing if the bumper is compressed and won’t spring back – it thinks it’s wedged under something.

Give the sensors a wipe with a dry cloth and make sure the bumper moves freely. While you’re at it, check the wheels and brushroll for hair tangles. If it’s still acting up, it might be a low battery that’s dying and restarting after a short charge, but that’s less common.

Nine times out of ten, a clean sensor is the fix. Try that before looking up error codes.