RegenMode?? Inserts dissapearing

I have a DWG and from time to time (actually quite often) when shifting to model space or to layouts the inserts get toggled off.
REGEN will not always fix it. It requires a RegenAll to display them.
I have RegenMode set to 1
Is there another setting I am missing?

Tried Audit:
Fix any errors detected? [Yes/No] :y
280483 objects audited
Total errors found during audit 0, fixed 0

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