I had that message when using windows shares but never NFS.
I would suggest you clear the media library (in system setup) and let it rebuild, depending on the number of files you have that could take a while. Then turn the machine off by holding the off button down for at least 5 seconds. Just a quick pressof the off button sends it into standby mode which means it is still connected to the network which is not what you want, you want it to disonnect itself from the network.
Turn the machine on again, it will take longer as it has to reconnect to all your shares. Wait for any messages to disappear, then set it into standby, a quick press of the off button.
Wait maybe 10-15 minutes before turning it on again. The reason for the wait is that by default the media library is refreshed when it’s put into standby mode. Then try to use the machine and see how it goes. That’s the procedure I use when I suspect the media library is corrupted and has always worked for me. Best of luck!
