I have been having trouble with my rear diff the past two weekends. After running a couple heats my rear diff keeps loosening up on me by the time the main comes. I completely lose all rear drive and end up running around with front wheel drive. I have completely disassembled the diff twice now, each time this has happened and there is absolutely no visible wear on anything. I am loosening the bolt about an 1/8 turn from all the way tight. I have been running the buggy every weekend since April and never had any problems but now this is happening every weekend.

Any thoughts?