We recently purchased seven R740 servers with Broadcom Netxtreme network cards after our last edge server lease ended. They are all running Server 2019. We are having a somewhat bizarre issue on every single one of these servers so I am thinking it is hardware related. 

Occasionally, all network traffic seems to stop and then will randomly start again. However, pings never stop and there are no errors in any logs. Network usage remains <0%. We started noticing the issue when RDP would stop responding and thought it was related to a known Microsoft bug but that issue has been patched and the issue remains. We also noticed that we sometimes cannot get a shared drive for about 30 secs. On the actual machine itself updates will stall out intermittently. DNS/DHCP both seem to be fine.

The issues is happening on all 7 physical servers in 5 locations. All of our virtual servers and other hardware are not seeing any issues. Has anyone else seen something like this? I have been beating my head against the wall for a week with no luck.