I am also having this issue, though I also intermittently have a blank screen. This is much less frequent than the Ethernet disconnect.

I have the exact same issue. If I'm using a USB-Ethernet dongle everything works fine.

Were you able to solve the issue?

Hey, we had a similar problem at work, and replugging the power cable worked up to now.

Tried that and a factory reset. Still dropping out for 3-4 sec every now and then.

I still have the issue. Initially I thought that I did manage to resolve the issue, however I did not. I can reproduce the issue only on single laptop (do not have to many). It is Lenovo T480S connected via USB-C to USB-C cable and I thought it is related to my router and this specific laptop, because once it disconnect, it does not get IP from DHCP until I reboot, and cable replug does not fix it.  I created static IP lease for my MAC address on my router and it seemed that it did resolve the issue so it is not required to reboot, however I still get short random network blips.

I tired connecting the monitor using the same cable to Macbook Pro and I was not able to reproduce the issue (no network drops). Also tried to connect to another laptop - Lenovo Ideapad 700 using UCB-C to USB-A cable and there is no network disconnections as well.

So my assumption is that the issue occur only on Windows computers connected via USB Type-C to C cable.

Same here.

Swappign with another U2722DE does not help either. In other words, I have tried with 2 different U2722DEs and both display the same problem - Intermittent disconnection from the Ethernet Port on the U2722DE.

Question... Do you guys have the Intel Iris Xe graphics and 11th gen Intel processors on your computers?

We are having other issues (USB Audio devices shutting down randomly) that seem related to this combination. And if this somehow creates these glitches in USB connectivity it might affect the Ethernet as well.

Mine is 8th gen Intel i5

We have the same problem with the Dell U2722DE (multiple monitors in the office). Sometimes loosing network-connection for a few seconds when using the built in network-switch.

We are connecting Microsoft Surface Pro 7+ systems to the monitors via USB-C. Using different cables did not solve the problem.

When using a seperate USB-Network-Adapter, everything works fine. Even when the adapter is connected to a USB-Port on the monitor.

So my guess would be, that there is a problem with the internal network adapter of the monitor.