Connection to server isn't fast enough to play standard non HD video
I am using a mid 2015 MacBook Pro running HighSierra v 10.13.2 and just upgraded to Plex media server v. 220.127.116.1102 today. the problem existed before the upgrade but appears to be significantly worse after the upgrade. I use an Amazon Fire TV Stick running Plex version 18.104.22.16839.
When I choose media to play on the plexapp on fire tv stick, the show will load and I may get a second or two or perhaps a larger portion of a minute before it will stall for a minute or so before the gray box with the error message "Connection to server isn't fast enough..." will appear. If I go onscreen to the settings cog and change the transcoding settings to something lower, it may restart for a moment but again I will not achieve a full minute before I get the same error. There is no transcoding setting available that will work, the lowest being 0.3. In the past, a month or so ago, I was able to overcome this problem when it would rarely occur by selecting a lower bitrate (transcoding setting) and suffer a lower quality of video in order to have continual video however there is no tradeoff now available. Log files are attached.
Any help would be appreciated.