I have a 2013 Highline TDI. The fan/air/heat has a mind of its own. When I go to manual the fan speed changes without me adjusting it. And the system often cannot locate the keyless fob such that I have to key it manually. Occasionally I can't even unlock the doors because the system won't pick-up the fob signal. All these things are exacerbated in frigid temperatures. Local dealer is stumped. Any thoughts?