Recently my 2003 360 Spider F1 has been increasingly going into neutral when upshifting. This has recently started happening intermittantly after the car has properly warmed up, and never when cold. It seems to be happening one in every 10 to 20 upshifts. Hydraulic fluid level is good, and not going down. Is the fix likely to be just an adjustment, or is something in the F1 pump or hydraulics about to break down completely?