Hi, new to the group but desperate to share.
I woke this morning to my eufy sitting still but with the roller brush going like the clappers, bearing in mind its usual clean is set for lunch time this was odd to say the least, the only way to stop it was the switch underneath, to cut a long story short, I took out all the screws and found a slug had died on the circuit board inside obviously creating a short circuit 
and another very dry slug corpse was also in there,
It’s been a strange day, but happily it’s now cleaning up nicely.
Roller brush spinning out of control
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Funny story.
Slug? A snail?
One should not use the vacuum in a snail farm (slug farm)