Just thought I'd share an experience:
-Notes were sticking on various scope synths
-Used MIDI monitor to isolate the problem to the keyboard controller
-Now had I been smart I would have looked at the erroneous cc:064 values that were randomly showing up w/o touching anything on the keyboard which would have pointed to a sustain command.....doh!)
-So it turns out the problem was a faulty sustain pedal of about 15yrs old.
Anyway probably common knowledge for most of you but maybe someone might find this useful.