Quick take
Clean the filter basket, straighten cable routing, confirm app/firmware status and check whether pool surfaces are suitable before assuming the robot has a drive or motor failure.
Remember: the 4 SE is corded
Cable management matters. Tangling or poor placement can restrict coverage even when the robot itself is functioning normally.
Weak debris pickup
A loaded basket or fine debris outside the filter configuration can reduce apparent cleaning performance.
Wall or waterline issues
Surface material, algae and geometry can affect climbing. Clean the pool surface and inspect tracks/brushes before diagnosing a motor fault.
App connection
Separate Bluetooth/Wi-Fi or firmware issues from cleaning-hardware faults.