Well, it's day 2 of investigation into this "issue" and as I suspected, I'd say it's simply a machine that was going to sleep and was being woken up by a new background process (BackBlaze) that I installed just after the RAM.  Duh! I put the 32GB Crucial RAM back in early today and the 8950 has been sitting idle for quite some time - no black flashes. Oh well - maybe this will help someone else?  
I've had my 8950 for a couple of weeks now (i7, 16GB, 3060ti, 750w) and it's been reliable.  I added an OEM air cooler a few days back - all good - all cool. I upgraded from 2x8GB stock RAM to 2x16 Crucial RAM DIMMs.  I did the upgrade early this am.  As I work on my corporate laptop with the 8950 sitting mostly idle next to me, I noticed that every 3-5-10 minutes, the screen just goes black, about 10 seconds pass, and it comes back. I just put the stock 16GB of RAM back in to see if it stops.  Will report back. But, in the meantime, is there anything I should have done after installing the 32GB Crucial RAM?  I ran the diagnostic after the upgrade once it found a different amount of RAM - all good.  Nothing else new.  Is there a setting in BIOS or some sort of set up? Please advise.  Thanks!
XPS 8950, 2x16GB Crucial ram, screen black outs