Robot Vacuum start falling off stairs

Happened to be around while the vacuum was running. Heard a loud noise and found it had fallen down a stair. I saved it before it fell all the way down. It has never had a problem with the stairs in the past, perhaps a change in an new update?
I restarted it at the top to see what it was doing. Watched it as it was cleaning the top edge of the stairs, looked like it was behaving correct. As it was moving across the edge, stopping before going over the edge, it turned to move away and backed up a bit and that is when it fell off again.

The last update to the production firmware was almost a year ago. So unless you are using Beta firmware, maybe you have a sensor problem?

The vacuum has 4 cliff sensors. Make sure they aren’t blocked or obstructed.

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