Hmm... yeah that does look very suspicious. What if you set your schedule during the day as a test?
Maybe also do MTR or pingplot or iperf during the time that it's running to see if its JUST that xfer / IP that's affected?
Windows Server 2016 & Windows Server 2019’s enhanced security protects at the identity, OS, and virtualization layers to disrupt attacks and isolate vulnerable targets. Support is continuing until at least 2023.
Yeah I know the history.. Been here a while myself.
But like you said.. "had". We all know how callcentres and support departments work. If there's no open call then it gets drowned out by the everyday noise.