have you replaced the bulbs or are they original to the vehicle? sometimes condensation is caused simply by an improperly seated bulb or dust cap. dry it out with a hair dryer first, make sure bulb and cap are properly seated, then reevaluate.
MKS comes with HID standard I think. if so, the ballast could be failing, or the headlamp switch/FLM could be. each bulb is fused separately at 20A and likely is in the engine compartment fuse box (BJB). (Fusions have them in the passenger compartment lol.) IME, fuses rarely blow, most times they need reseating. unless there is an external force like water, rust, dirt, etc.
one other possibility is the shutter inside the headlamp that switches high to low/vice versa. might not be working correctly. make sure it is activating when commanded. do see these fail from time to time.
if you need a used headlamp, check ebay or
car-part.com.