Hi,
Thanks for the suggestions.
It happened with 2 different show file at 2 weekend. I didn't tried with blank show yet.
(Most of the time I prepare the show file at home in workdays on another computer, and at the weekend I just load them on the PC above.)
I checked a memory usage both in Task Manager and in the MA3 software, and It never went above 3,5-4GB (it was same at both place). So well under the critical. The CPU usage under 15% all the time. Only the GPU is a bit high (30% in default, 70% in view where is 3D window). I did't checked the video memory so far, maybe there can be the problem. (But never before experienced lagging, or frame dropping, or any graphical problem. And when this freezing happening and I click on the Windows red X button the confimation window came up, just I can't choose between Save-Exit-Cancel.)
I will check the memory share asap.