Hello everyone thanks for your replies.
The car has the automatic (i think) touch screen controls.
I removed and checked the blower motor and noticed there was some trash inside. I removed the trash and re-installed the fan and all was fine, the car was behaving (coincidence?).
It is predominantly my wifes car. She tells me that when it fails there is no air whatsoever coming out the vents anywhere. The touch controls are responsive and show a change of fan speed temp etc on the screen but nothing happens with the fan or temperature. Sometimes a reset works, sometime it does not. Generally, she tells me that when the issue is there it is when she FIRST starts the car and then 5 minutes down the road it will rectify itself.
Really strange! Any ideas?