Express is possessed

I got my express REFURB about 5 or 6 months ago. I used it 3 or 4 times over the winter while I was shoveling my walk and driveway, and it worked just fine as it did last week while I was gardening. TODAY, I went to use it and it wouldn’t turn on at all. I figured maybe it needed charging (it was only half uncharged) after SEVERAL attempts to get it recognized by my computer, it finally charged fine. Then I unplugged it after the unit said CHARGED, and it wouldn’t work again.  I left it on my computer desk and have noticed it turning on for about 5 seconds or so BY ITSELF, and then shutting off again…

NOW, after playing with it and trying all the hard reboot methods  I have read, I finally got it to go on,but now the volume is jumping up and down…

(It still goes on for about 5 seconds or so and turns off.)

I can understand why it was returned…

Is it possessed or something?