My lane departure seems to always fault out on trips over a couple hours.  Audi service always tells me it working fine and no faults. 
I get a right high beam error, right low beam error, left, ditto, ditto, ditto. 
Any ideas please? 

Camera fault I suspect. Ha ebthey done a diagnostic check to see if any fault codes flag up. 

 In the first occurrence, the dealership changed out the front camera.  Since then, it's gone out three more times, and the dealership tells me it's working fine for them. 

The last time, I was about 200 miles from home and driving through the mountains. I had a plethora of warnings and the dreaded orange warning light on the dash. I cleared out the errors but forgot to take screenshots of them.