Did you ever find a solution for this? Have a friend with a new LG tv that appears to have this same problem. Get the "checking connection speed" message then just spinning yellow circle.
No, ended up using a Fire Stick and loaded Plex on it which works fine
PLEX app on both LG Tv's won't connect after last update
in LG webOS Smart TV App Questions
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No, ended up using a Fire Stick and loaded Plex on it which works fine