my head light intermitently dont work. on 2008 Chrysler Town & Country

my lights all work like they are supposed to them one or both of the head lights goes out. then they will come back on and all of this is intermitent then some times it never happens at all.
it only affects the dipped beam the fog lamps and hi beam are never effected.......
Any ideas?

Asked by for the 2008 Chrysler Town & Country