Lost NFS share

When we came in this morning, our server has lost it's NFS connections to the Open-e server. On our server, the command df -h showed the nfs mounts, but the stats were all blank. I was unable to view the contents of the mounted directories, and I was unable to unmount them, I received an error, about the share being in use. I ended up rebooting both the Open-e server and my server in order to get the NFS shares mounted again.

Over the weekend I tried to run a backup, on the open-e server. The backup appears to have failed, could this have caused my server to lose it's connection to the NFS shares?

Where in the open-e logs should I look to try to figure out what happened?

Any help would be appreciated,
Thanks
Jonathan

Looked over the second logs and see nothing!!! Did you check to see if you can connect when the second time it happened that you can connect to the GUI from the Bond?