C300 Low Beam Headlamp goes out then back on, repeated.
 

My 2011 c300 low beam headlamps were recently replaced and have been operating fine for several months. Two days ago I got a Check Low Beam warning and the light was out. The next morning, it was working fine and the warning was gone.. Then later in the day went out again w/ a renewed warning light. Etc for today. I've checked the connection. Obviously, the bulb is not out and the ballast is also seeming to work. The wires (that are visible) seem whole and strong. What could be the issue?

You have a ballast , then it's HID, I would think a bad ballast.