Odd issue with fog lights
 

I am experiencing a strange issue with my factory fog lights - which are 100% stock by the way.
Every so often they will flicker off and on for just a split second. It doesn't seem to coincide with bumps in the road or anything like that.
Where should I start looking? The switch? A bad relay? Or somewhere in the wiring harness?
The headlights are not affected in any way.

Id check relay or fuses.

I'd check the switch itself for a loose connection that could be causing the interruption.... or the bulb itself could be shorting out in the filament....

Bulbs are both brand-new. And when they flicker, both bulbs flicker simultaneously. It would be very unlikely that both bulb filaments are shorting out.

to me it sounds like a loose ground somewhere.....

Ok along the fog light topic here.. Mine work well but one is so hazed over that its like its not there, is there anything that can be used to clean all the crap off of it?? And I'm gonna agree it could be a loose ground or even a minor break in a wire somewhere