Why do the headlight sockets keep melting? Tried using low temp ones and no luck

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Problem has occurred twice since February 2016. We even tried using low temperature sockets and everything was fine for about a week. They melted also. This is constantly causing one or the other and sometimes both headlights to go off. My husband then has to push on the socket and then both lights will work. The headlights will also act up if you try to use the high beams. Sometimes the high beam indicator light will stay on and of course, one of the headlights is out. It's the craziest thing and also very aggravating. Everything works fine until the sockets start to melt. Thank you.