It sounds like that clutch needs to come off and be looked at with the cover off. There could be several things cause the sticking. An outer cover bearing might be shot (which can wear the shaft and ruin the clutch). It could also be that your weights, rollers, pins, etc are so worn that they don't move freely as they're supposed to. If they go far enough, they'll take out your spider. It could also be something else. I'd do a serious look-see before it's too late, if not already.
Belt dust in the main bushing will cause it to stick as well. Try blowing the clutch out with compressed air and then clean it with brake cleaner to get rid of the junk. Pulling it and disassembling it to check for worn parts is also a good idea, sometimes you can't see worn bushings, rollers, or weights unless it's on the bench.
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