My bike has had this problem since it was nearly new. Mine runs at 2200 to 2400 rpm when it occurs. I now have 27000 miles and it still does it every 500 or so miles. I have turned the ignition off and restarted a few times when it has happened without curing the problem. It normally lasts for 5 minutes to 15 minutes and then goes back to normal operation. I've not been able to figure a pattern to it. I consider it a safety issue and have tried to get Yamaha to figure it out and fix it but because the dealer was unable to observe it happening, Yamaha said there was nothing they could do. I thought I was the only one!