Random Burnout?

I have a 2014 13.3 inch Macbook Pro MGX82E, which is in otherwise perfect condition. It has never dropped or hit anything or had any spills.

Last night I was using it to scroll through my FB feed, nothing extreme. When I was done, I closed it and placed it on my coffee table, unplugged. When I woke up in the morning, I tried to turn it on and nothing happened. I plugged it in and waited a little while to see if the battery was uncharged and nothing. I followed some online tutorials to see if there was something I could do to diagnose it, nothing worked.

I brought it in to my local computer store and the dude called me this afternoon notifying me that it had fried. I asked him how that could possibly have happened if last night it was completely fine, laid comfortably upon my coffee table and it wasnt even plugged in. He told me that I would have to pay $700 to replace the board because it doesnt recieve any power and that it most likely burned out... without any explanation as to how it could have happened other than "the electronics are very sensitive".

My question is whether thats possible or common... for a relatively new macbook to just die out of nowhere like that?