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There have been numerous people that have experienced the same problem or similar. I believe that some were due to water ingress into the infra red unit. The water had made its way into the unit by way of the arial mount. It may be worth your while checking the area to see if any water has gotten into the unit.
Beyond that, I am unable to help I'm afraid. Maybe somebody else could shed some light on this for you if water ingress is not your problem.
Currently in scatz's garage:
2004 Subaru Legacy GT Spec B, a 2013 2.0 TDCi Titanium X Sport S-Max and a 2001 Honda NSR125R