Could you try the patches mentioned here:
http://linux-nfs.org/pipermail/nfsv4/2010-February/012075.html
They might help here too.
** Changed in: linux (Ubuntu)
Status: New => Incomplete
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Multi-user sec=krb5 NFSv4 client blocks when one user has an expired ticket
https://bugs.launchpad.net/bugs/409438
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