The AF switches to MF whenever you (accidentally) touch the left side of the screen (which is actually the right lense view). To fix it you need to touch the right side of the screen and then you can recenter the focus area by pressing the joystick. So I think it is a firmware bug in the camera. I really hope Canon is monitoring this and will make a fix soon.
They should have made the left side inactive to touch and also they should have made the pressing down of the joystick works no matter where the focusing area is. Right now if the focus area is by accident on the left and you press the joystick the focusing area recenters but on the left (MF) side.
One trick I found to help with this problem is to turn on the Menu->AF->MF peaking setting->ON
In this way when I am using the Eye View Finder and if the AF is in Manual I usually see a lot of red color indicating that I am out of focus. (It’s hard to see the red indication on the screen)
