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When you say dropping off the screen, do you mean it completely disappears
I do find you have to set up the icons in landscape and check portrait as portrait can mess with them. Some will appear in portrait but not landscape and I have to move them back over. Once done, the positions stick. I don't position them for portrait at all and then it just works whichever way I rotate my tablet.
When you say calendar icon, do you mean widget?
Maybe you could try a different widget, I use simple calendar from play store on my tablet and phone without any problems.
pellicle said:UPDATE
The calendar drops off when cycling the wlan on and off via the screen control widget
Be interested to see if others replicate this issue