Had a similar situation last week.. Was working in lightroom, finished up a book and went down tto have dinner. The battery was charged fully. Came back to turn it on, keyboard turned on, I think Acer flashed once and then it turned off.
I called Acer to see if they can help me out. They made me follow some steps with pressing a pin into the battery button on the bottom side. After half an hour, nothing worked so they told me to send off to Acer to have it looked at.
I got a call from them today saying it's ready and asked what the issue was. Apparently it was an issue with BIOS. (I was a bit skeptical about getting a machine with Intel i5 6200 because I did some research prior when I was thinking of getting an intel nuc's; which were failing due to heat). Hopefully it's just a BIOS issue and nothing else.
I'd recommend to give Acer a call and troubleshoot it, if all fails send it back and have them take a look at it.