Has anyone had problems with their motor mounts? Nissan has replaced my motor mounts 5 times, all under warranty or extended warranty. The electrical part that adjusts keeps shorting out and they don't know why. When I shut the car off, the motor mount runs 5-8 seconds then stops. When it finally goes out, it continues to run and runs the battery down if you don't disconnect it. It's an Altima 3.5