Ok guys so I bought some LED festoons for my a4 b8 2011 around 3 months ago from CrazyLEDs, and they seemed to be working well. But yesterday, while one of my mates was driving behind me, he told me that the far side bulb was flickering. So I checked and was confused because when I unlocked the car, the welcome lights come on and the leds didn't flicker. The bulbs flickers only when the engine is running. Does anyone know why this happens or what could be the problem? Thanks in advance