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Follow up.

I found today as I was testing some other code with hobby servos I had the same pause. Turns out with further investigation I had packet loss every 12 seconds in the Diverstation status trend. This matched the pause spot on. With a bit of searching I found others had this issue as well after installing Autodesk Inventor. Yes I just installed this too. I killed the Autodesk update manager and trouble are gone. Used System configuration to disable all Autodesk apps from starting on boot.