I am going to start storing it without the dock to find out if it is related, but I am having severe battery drain when leaving the tablet asleep.
Yesterday, I took it off the charger with 100% charged tablet and dock batteries. I also made sure to turn the screen off after it came on when I unplugged the device (at one time I thought my problem was because of never opening the tablet/keyboard dock after unplugging). When I got to work, I put it in my desk, and didn't open it all day, and left it in my desk. This morning I come in, and the battery on the tablet is around 9%, and the dock is somewhat down, although not so much as the tablet itself.
Previously, I've had many a time where I've stored the tablet docked and closed, in a protected neoprene case, only to open it some time after lunch and discover the tablet to be very hot to the touch. When I open the tablet, the battery on the tablet tends to be below 4% remaining. Sometimes the dock battery is below 20%, sometimes it appears to have gotten so hot that it no longer registers with windows (at that point I have to let it cool down and fully reboot the tablet.
I have let the tablet sit outside of the dock all day previously, an didn't seem to have the same problem, but it is very inconvenient to store this way, as 90% of my reason to purchase this tablet was so I would have the keyboard when I needed it (often), and occasionally to undock and use as a true tablet.
Is anybody else having issues similarly with theirs? I feel like in some cases, the battery draw / heated batteries are related to being connected to WiFi, but I haven't spent time testing it in airplane mode.