I know this is an old thread but I have had the same problem. I did have the clutch replaced with a ceramic one. One way I was able to disengage the transmission when it was screwing up was to have the clutch pushed all of the way down and throttle up the rpm's that seemed to "relax" the clutch and disengage it. I was afraid it was going to " do it's thing" at the wrong time so I had it replaced.