2015 RS5 - Started getting LEFT headlamp warnings, lamp was on, then would quit working. Took to authorized Audi dealer to have fixed, replaced a bulb and did diagnostics. Found no other issues. $$. Within a few hours, started getting the same warning message for the RIGHT headlamp. The warning doesn't come on immediately when you turn the lights on, but it will come on after a few minutes of driving. Lamp is out when the warning is on. Does this sound like I am just unlucky enough to have both lamps go out within a few hours of driving, with a trip to the shop in-between, or is there something more complicated in the system of sensors and diagnostics?