Hello,
This problems looks a lot like the one discussed in this post (link).
It is unsolved so far; in my reply I ask for certain log files, maybe you locate them on your PC and send them to me?
I have suggested a few times to hide viewers (via View->Viewer) if they are not really used, since, as you mention, the problem seems to be memory related. But I haven’t heard if this solved anyone’s problem.
-Han