CAR - 2005 mazda6 sport 2.0TD UK

My passenger side xenon has started to just cut of at random intervals when I am driving

So I did a test, I turned them on, both fine, after 30 mins of driving the passenger one cut out. Turned them on and off quickly and they both started working again

Did another test, the passenger xenon just stopped working after 10 mins of driving....

OK, then on top of that while I was driving today, both xenons flickered like really quickly randomly, then it happend 3 -4 mins later, it looked like a reallllly quick flash

So anyone upto guessing what the hell is going on here?

Cheers

Oh yeah, when I parked up, I could see the left light flickering ever so lightly against the wall

Oh and does anyone know where the ballast / transformer is in the mazda6??