I still had problems and kept researching and google put me back at the Plex Forums. I think the real fix is configuring the options for your router. I found posts for the AT&T fiber-optic modem. This discussion was rigging ‘port forwarding’.
Plex forums – port forwarding for Arris BGW210
After I tried the example to port forwarding I could see each device can have its own custom streaming channel and bit rate. I had to determine what the PMS device was from studying Attached Devices within the router log-in page. During router network setup I could make a custom rule for maximum upload bits. Afterwards Plex can adjust my video playback for optimal video to wifi connected devices.
Port forwarding is the back-end of this problem. The front-end is the Client software, Plex will keep a better database of your files if you clean up ‘Authorized Devices’ in Settings. Be careful and thoughtful about tossing older Device configurations represented as tiles. It is here that Plex ties together Resume time for partially played video, which device is part of the sharing group, icon graphics for movies/videos, labels and deleted videos. DON’T delete any Authorized Device that is less than 2 months old. I could see this happening because one Device I deleted brought back a bunch of movies that had been deleted a long time ago. IMHO, the user can be clicking on a zombie file that doesn’t have all the current attributes of being played or deleted. Plex cleans up the database at night so expect the return of the usual desktop with all the metadata corrected the next day.
