DIAGNOSIS The robot is stuck in a 'start' loop because it can't confirm its bin is properly seated or the filter is clogged.
FIX Remove the bin, empty it, and re-seat it with a firm click. Check that the yellow bin release tab is fully engaged. Then hold the CLEAN button for 10 seconds to reboot it. That usually clears the beep-and-freeze.
IF THAT DIDN'T WORK Take the filter out and tap it against a trash can. A heavily clogged filter restricts airflow enough for the robot to refuse a cleaning cycle. If it's really dirty, give it a light vacuum.
HEADS UP Don't run the robot without a filter or bin installed—the sensors will detect it's missing and keep throwing the same error.