Losing network connection - Windows 10

Hi,

I'm having an issue with workstations losing server connection. All the mapped drives disappear and if I view connections from the tray icon it shows the user is no longer connected to the server. This seems to happen more frequently on machines that have been idle for a longer period of time (45min ). I've disabled sleep in GPO, I've also gone into the NIC settings and unchecked "allow Windows to turn off this device to save power". I didn't have this issue on Win 7. I'm running Windows 10 LTSC 2019 with Client for Open Enterprise Server 2 SP4 (IR12). Has anyone else run into this?

Thanks.