A fuse or possible the head light switch or relay .
Start with fuse most relays on Chevys are inter changeable try swopeing it with another one .
If thats no good test the switch it has more funtions then just the head lights see what works and what dosn't IE parking lights dome light high beams ECT.
When that happen to me it was headlight switch. I have also seen the relay overheat but most likely the switch
Headlight switch is probably overheating and needs to be replaced. draws alot of current.
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