The bottom feed paper-out sensor is likely hung up on a paper shard; the machine can't tell when the paper has gone past the sensor. A good blow-out of the chassis with compressed air will often clear it up. If it doesn't, you'll have to make a visual confirmation that the sensor is toggling normally and is undamaged. If all appears to be ok mechanically, a check of the sensor's electronic signal output is in order (often much easier said than done). Failure of sensors' electronics is extremely rare, though.
Generally, whenever you encounter this symptom from whichever paper path, it's a binding paper-out sensor that's causing it.
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