250r king

Well went get some food today. when I was turning in the drive thru I honked the horn. The car drop a few rpms thought it was me letting off the gas. Well I get home and honked my horn to find out what happened and it dropped rpms again so I tried holding the horn and then the car rpms drop to 0. I turn the key and starts right up. Tried rolling up and down the windows playing the radio lights the works and nothing. only when honking my horn