I recently bought a XT1. When I was done cutting the grass today, I turned the key to the off position and the motor shut off but the mower was making a buzzing noise. I turned the key back to the run position and it started. Then I shut the mower off again. It shut off with no problems. Then I started it again and put the mower away. It shut down with no problems. Does any body else have an issue with their mower doing this?