Hello @cz57avenger ,
Thank you for posting here.
When the problem occurs, we can try to do:
1.ping server.local and click Enter.
2.Ping the IP address of the two file servers and click Enter.
3.If we can ping the IP address of the two file servers, but we can not ping the domain name, maybe there is issue related to DNS resolution.
4.Open Command Prompt on client ,type nslookup and type set d2 .Then type server.local, we could find out the problem through the process .
Type NSlookup and click Enter.
Type set d2 and click Enter.
Type server.local and click Enter.
Here is the guide for Nslookup :
Nslookup
https://technet.microsoft.com/en-us/library/cc940085.aspx
5.Meanwhile, we can map the drive manually on one client to see if the issue occurs when the problem occurs we mentioned.
Hope the information above is helpful. If anything is unclear, please feel free to let us know.
Best Regards,
Daisy Zhou
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