Xbox 360.. frying my disc

this is my third xbox360 so far.. ive had my newest one for quite a bit though. for some reason, while im playing a game, the disc will come to a halt, i know this because i can hear it, a loud grunting noise. and then BAM! your game is unplayable stuff pops up. Anyone want to give me a number for customer support or tell me what to do? thanks.