We are regulalry seeing this failure message and once it hits then all following backups fail (obviously). I'm guessing it's associated with the metadata.exe processes being stuck as I can guarantee I will see many of these whenever we see the failure message.
I'm at the point now where I have to reboot every other night to ensure success, which is crazy I'm sure you will agree. Does anyone have any idea when this will ever be resolved. This has got worse since upgrading to 5.5.
Thanks for any suggestions or pointers.