I have a mk1 facelift focus on an 05 plate which is continually blowing headlight bulbs.. They are only lasting a few months and then blow again

To start with I just changed the bulb that had gone but then the opposite one would go shortly after and after about 6 bulbs I replaced the pair at the same time with Ring super bright bulbs which lasted around six months but one has now blown..

Is this a common problem, can't seem to find anything about it anywhere?

I have just stared using the heated screen again and wondered if this could cause a surge when turned off and would a resistor help?

Any ideas appreciated

Mike