My TC 33 (HST) has had a problem with shifting the levers from neutral since new? I sometimes have to push and release the clutch 3 or 4 times to shift from neutral. I should have had this fixed under warranty, but the problem doesn't occur all of the time and I just let it go. I did mention this to the dealer and he said the linkage probably needed to be adjusted. Has anyone else had this problem? How can I fix this?