Syncing DL.3 Times

I'm having an issue with a group of DL.3's I'm using for a project. 4 units, 2 are brand new, and 2 are 2 years old. I make a 2x2 college, and over time, the video timing skews. Fixture 1 is my upper left corner fixture (and the oldest) -- I have no sync to or sync type. On fixtures 2>4, I have sync to (1) and sync type graphic 1.

Why is the issue still happening? Network cables are attached and all fixtures are seen in CMA. Newest software release. Hog III, 3.1.9. Unmanaged network switch between them.
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