A family member of mine (that is not tech-savvy and in another state) has the same model TV and has been having the same issue as you describe. This may be an LG specific issue, check out the post on this thread: Plex app on LG TV says Network Unavailable - #32 by mahu64
I would love it if you could try the suggested steps in the post I linked and report back with your findings. This would make it easier for me to troubleshoot my family member’s issue.
Happy to assist further if the steps from the post don’t resolve your issue.
Thanks!
