Is my phone just simply dead?

Hello, today I was just sitting on my couch with my phone playing a game. All of the sudden the phones screen flashed blue and black, made a buzzing sound. This worried me a lot so my first reaction was to force shut down it. The phone would not give any response to any input I made. The only response I got was after I plugged it in the charger, where the LED would flash on and off repetitively (even though sometimes it would just stay on as if it was charging).

All I know is that the phone had about 80% battery and it was as hot as normal. I was not charging and playing simultaneously.

I am seriously dissatisfied with this phone as it is relatively new ( was bought in September 2015).