93 Wrangler headlights going out, coming back on

I have a 93 Jeep Wrangler, 4.0 Standard trans with 90,000 miles. My High beams will go out while driving then come back on a second later. It is only my headlights, not tail or marker or park or dash. Sometimes it happens right away and sometimes I can drive for hours without it happening. My low beams seem to be less affected.