the media is not available. the associated file is not available. make sure the file exists and that

plex works well when the shield starts, and media are available and instantly read. Only after some time at a new trial, the media become unavailable and when I want to read I have the error message that appears. I have to restart the shield for the media is available again ..

the media are on a nas Asustor AS202TE connected to the network.

Is anyone has the same problem as me and a solution?

https://support.plex.tv/hc/en-us/articles/201806463-Why-does-Plex-Media-Server-say-my-content-is-unavailable-