no, in terms of moisture, i meant the in the lens of the light, not the bulb itself. MIne for example is cracked on rear right, and there is tiny bit of moisture. It is on the side of the car, not back of the car, so its hardly noticiable but i think thats whats causing mine to be wierd from time to time. Someone also once told me that the brake light switch overheats easily if you stomp on brakes many times and keep your foot hard on them or smth, so i remember since then, i was more careful with brake pedal, i.e. not stepping on it too hard on stops more then necessary, and i had no problems since.. wierd, but "kinda" worked for me for now..
Stock '07 Z4 3.0si - Titanium Silver/Black/18s OEM 135M