Does not work on fire hd 10 watching Prime video

Aside from the fact the device should come with a sleep timer already built in, the timer app would pause as soon as I switched to the video app. After several attempts at trying to figure out how to use it, (no instructions included) got it to work on a 5 minute setting-- it simply froze the video on the screen. Rate it a 0 if possible. I like to watch movies in bed at night and more often than not, fall asleep before it's over. Looked everywhere for a solution to save battery and this was only option I could find. That said, it's absolutely useless for my needs. May work well for music on android phones.

###

