Why can't I see recent apps and can't power off my Sony Xperia M4 Aqua?

i can not power off my device and also restart it




hello how are you doing i just got a replacement cell phone the fist one did not work at all so my mom and i we called up and told the head office of what happen so they told us because its not our fault they mail us another  one with 10 days to mail out   so i got the 2 cell my mom and i we went to bell center at stone road mall in guelph to get it checked and set up it worked fine until  i charged my cell so no when i go to turn it off it will not do anything or when i swipe the screen it dose not do anything so i ask please help thank you 



Not the answer you were looking for?