there are 2 control cables on these.One for the hot/cold and the other for up/down/face distribution.It could be that the cable has gone out of adjustment as they are held onto the heater box control mechanism by a metal claw clip,so the cable may have moved,causing your problem.I would not say it is a common problem,but have seen many Corsa models where the rotational control does not feel positive,although the function works ok.Access to the rear of the heater control panel is an absolute pig of a job,but it is possible to get to the cable where it is clipped to the main heater box.
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