Outlines dissappear

I have an issue with Rhino 6 display.
Whenever there is an model with more than 200-300 elements (mostly blocks) elements (the outlines) disappear when zooming in.
Full view:


More zoom and part disappears:

When selected it is “visible” again:

and shaded mode it is no problem at all…

graphic card is NVIDIA GeForce GTX 1070/PCIe/SSE2 with current driver updated today…

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