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I can't imagine anyone here is still running 1912 without any CUs. You should at least be at CU3...

Trust me I know, I just started the position and going over all the stuff I need to fix.

Maybe we have a similar issue. so far the problem occurs on two devices- latest Citrix Workspace installed, VDA 2203. Did you find the cause? Only the screen freezes, they don't loose the connection. VPN and internet connection are stable