Mid flight ESC failure
 

I just got into the drone racing hobby. Sooo i'm a noob and i've got a problem. I built my first drone watching a video. Link I built the upgrade model and everything works.. so i thought.. the thing starts randomly twitching and then crashes to the ground. Here is an I have absolutely no idea what the problem is. I'm pretty sure that its the ESC s but I don't know. Please help!!!

One thing I've noticed is that every time it falls it makes all the little reboot chimes and reboots.