I've been having this problem for 3 weeks now. I have a MID 7032-4 tablet and its not rooted. Everything works fine except when I turn off the tablet. I do not put it on standby but I shut it down. After 24-36 hours of being shut down, when I turn it on, I lose 50-60% of battery. (e.g. I turn it off at 90% I now see 30%) I have optimized all my settings for battery performance (wifi turned off, airplane mode, display dimmed, battery saver app, everything.) I have proven this because on standby / sleep I lose only 5% of battery life. So no problems when in use or in standby. Only when turned off do I lose a lot of battery. I have done a factory reset to no avail. I tried a full charge and full discharge to no avail. It also seems to happen once 24+ hours have gone by. Because if I turn off my tablet for only 12-13 hours, I don't lose any battery. At most 2% which is normal.