Hi
We are also getting this issue on our RDS servers running windows server 2019, after a few days the vm fully locks up and the only fix there on out is to turn it off in hyper v and turn it back on. Disabling Network threat protection fixes that issue, we have had no reoccurances since then
After the restart, are there any errors in the Windows Event log, System I guess is most likley, prior to the lockup?