Question for you, does your MVP make a high pitched sound?
Mine does. It even makes the noise when I have it turned off. When it finally arrived (USPSnail) it had no charge at all. I was wondering if this sound problem can run the charge down all the way.
I would contact the vendor you purchased it from and see if they will send you a new one. Sounds like the one you received is not working properly. I would think it would wear down the battery if it is still making sound after turned off. How strange.