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Bad news 😢
I followed your instructions in the link. Upgrade all 3 pg42uq’s firmware to V033, installed the driver for each monitor.
Then I enabled surround, still periodly black screen for the middle monitor when play game (dirt rally 2.0).
I ordered two Zeskit DP cables. See what happens after I replace the cable.
If problem still exists, I will ask asus service for help.