Phone restarts without reason

Hello.

I have LG K10 i bought it new. I was plaing game when phone start to restart and its turn on and then again restart. Then it shows something like error ther was something like console i dont really know what was that. And last thing what i saw was " Jump to Dload Mode" and before was something like atemt killing the inic or somthing like that. There was black screen with white words and numbers. Im sorry for my grammer im not from countries where are English.