Hi. Mine has always done this. But only the headlight bulbs, never any tail light bulbs. It used to slightly worry me, but now I just keep a couple of spare H7's in the boot cubby hole.
Richard.
1999 HDI 110 GLX Estate Sold On at 230,000 miles to the lucky John
2003 HDI 110 Rapier Estate
1998 D8 1.9XUD Estate LX 7 seater Estate sold, with regret
1999 306 1.8 petrol.