Head Light Problem

[llx3L]

So driving tonight. I reliezed my headlights seem to strobe.
Not extremly bad but noticable when on my garage door.
And for oncomming cars.
Headlights are stock I've changed nothing.
What could this problem be?
I didn't even know what to search.
You type headlight you get 1,000's

 

[llx3L]

Scratch that.
Searched Strobing headlights.
I found it...

 

[Matt R]

See, this is a good lesson why to always seach a few different things before posting!

 

[kw8z3boi]

yep or else everyone will hunt you down for being lazy