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The console clearly has a problem. Try a prolonged rest-reset with the machine unplugged, overnight at least. During that rest, with power Off, give each touch-key on the console a sharp tap, in case one of them is stuck.
If that doesn't cure the problem, then, how old is your Z9 Soft Treadmill ?
The console might have to be replaced. Or, if the treadmill has ever been moved, it may need to have the data cable(s) to the console re-seated, too. They might perhaps have pulled loose either with time or with having been moved.