On you sound clip it looks like their is a point, on the modwheel(near zero?), where value jumps to max for a short time. It does happend each time when moving fast.
Can you find it if you increase modwheel slowly? can you find a specific point, or is it random positions?
Can you log Midi outputs using MidiOX on PC, or MidiMonitor on MAC, and send to me as a text file? That would be very useful. Let me know if you don't know how to do that.
I see 2 solutions, either your modwheel calibration is bad (can be fix by software), either you modwheel is faulty, it needs to be changes.