We have been observing issues with our file Cluster (Windows Server 2012 R2 Std Clustered with 2 Nodes) where File Server gets unresponsive for SMB access request event id 30809 in Microsoft-Windows-SMBClient/Connectivity is observed and when we try to failover the role clustered disks fail to get offline with an error in event id 1069 Cluster resource ' Disk Name' of type 'Physical Disk' in clustered role 'Role Name' failed, we have to force fully reboot the node which faces this issue. It works properly for a week and again we get the same issue, this happens with all the disks in different file server

Can you check clusterlog? You can generate cluster log by running the below command in powershell.

Get-ClusterLog

https://technet.microsoft.com/en-us/library/hh847315.aspx

Thanks,

Umesh.S.K