maximum size cleaning area?

i’ve been trying unsuccessfully to get my robot to map a large space. Approximately 8000 ft.². It does the edge is fine, gets to the middle, and then says there is a sensor error. There is nothing blocking the sensors that I can see. Then I ask it to return to the dock, and it can’t find the dock.

So I place it on the dock and it just comes off and wanders around.

Feeling pretty frustrated. Can someone help?

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