Wirelessly posted (8820)
Here is a thought. I'm just speculating ...
Next time it happens, press alt-back/esc - or whatver you do on your model - to bring up the ribbon. If you can scroll through the ribbon, see if you can switch to one or the other, either the prompt or the calendar edit screen. Say you can switch to prompt and snooze it, then do that.
Just a thought. I don't know if it will work. But since you saw this issue on the 8700, too, I think the solution is going to be something like that.