I have a big problem when my head lights are on for more than 20 minutes they cut off then I can pull in the turn switch and they come back on and stay on for about 5 minutes then it happens again if I turn the lights on then turn them on high it happens in about 5 minutes and when I turn them on low they will work fine for about 20 minutes

 

Check your grounds for the headlamp loom.

 

Also check the headlight relay. Sounds like it could be overheating.

 

????? i hope u figure this out.

 

Check the wiring, it may need to be redone.