Hi. New user! I am using my Wattbike atom and I have done a couple of races so far and about half way through the race my gears suddenly increase to 22 and are intermittent from then on. Dropping from 22 then back up again without me touching. Gotta admit it’s bloody annoying 
Does anybody know what could be causing this or if it happens to them?
Any help would be appreciated
Many thanks
Toby