I brought the drone down to the area near our condo pool before lunch. Nearly as soon as it took off I got an error message telling me to change the propellers on the left, rear motor. An online search of forums suggested it could be an issue with the most recent firmware update. I followed instructions to revert to the previous version using software for the PC. After that, I reinstalled the update.
The fix seemed to work perfectly on an indoor trial. I went outside before dinner to see what'd happen outside. I walked up in the neighbourhood a little bit. I went to the playing field near the elementary school on the former site of St. Mary's Hospital.
After being in the air for about 10 minutes, the error warning returned. I kept flying as the area was safe to do so. However, I came back and changed the propellers as the controller software suggested. I'll check again tomorrow to see.