Hi there,
Is it not showing after some inactivity within the client PC ?
This behavior occurs because the systems can drop idle connections after a specified time-out period (by default, 15 minutes) to prevent wasting server resources on unused sessions. The connection can be re-established quickly, if necessary.
To resolve this behavior, change the default time-out period on the shared network computer.
To do this, use one of the following methods in the below link
https://learn.microsoft.com/en-us/troubleshoot/windows-client/networking/mapped-drive-connection-to-network-share-lost
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