Having an odd problem with my '09 Golf 1.4 TSI (122) recently - occasionally when I pull away from traffic lights (I think mainly when the engine is cold), the dashboard lighting and the radio will die for about a second then come back on. Looks like something's making the voltage drop momentarily (shorting out somewhere?), but not sure what. Headlights don't seem to be affected and no fault codes logged that I could find. Anybody seen anything like this before?