NFS through SSH tunneling hangs after 5-10 days

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Issue

NFS access via ssh tunnelling hangs after 5-10 days and requires a reboot to fix
Hang does not happen on all clients at once, only on individual clients
On few servers, may notice "NFS not responding errors" prior to the issue, but not always

Environment

Red Hat Enterprise Linux 6 NFS server
Red Hat Enterprise Linux 6 NFS client

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