Issues with Plex after version 1.3.4 Keep having to downgrade

I currently have a plex server AND a backup plex server both with the same content both running on Windows 10
My main server has issues anytime I upgrade past 1.3.4, if you try to remotely direct play anything it launches the title and immediately freezes for 4-5 seconds, plays for maybe 3 seconds and freezes again and so on. I have PlexPy installed on both servers and when this happens it doesn’t report as buffering. I had my brother try his PC and his Shield TV. IF I downgrade to 1.3.4 everything works great again.
I brought up my backup server upgraded to the latest version of Plex and guess what? It played perfectly!
I know its not the Internet connection as 1.3.4 plays fine, and I now know its not the Plex version as it doesn’t do it on my back up server.
So I am left with, it has to be my plex install. Does any Plex engineers have any ideas? When I roil back to 1.3.4 I do a uninstall through add/remove programs. IS there residual stuff I can manually delete after that without wiping out my DB?
If I have some issues with my DB, it wouldn’t affect playback correct?
Could it be something to do with codecs I have installed?
Thanks in advance to anyone who can give me some ideas of things to try from here.

Also, this only happens on Direct playing, transcoding works fine.

I have a new development, my brother now tells me that when it freezes it shows the “your connection is not fast enough” message. This happens on his PC and on his Shield. If I downgrade to 1.3.4 its fine again.

I’ve been getting the your net fast enough message a bunch also since that release on my Shield TV on a local network. CPU is low but my disk activity is high due to disk coping and SnapRAID parity. For me I think it’s disk activity causing the problem. BUT here is the strange part. I can run Plex in a VM on the same machine with 1.3.4 and not have a problem while the main server gives the error.

It would appear the message is a bit premature at times and really should not be shown.

My issue isn’t random, it is repeatable over and over until I downgrade back to 1.3.4
I am really at a loss of things to try at this point.
I did notice the following error in my log file. “Failed to stream media, client probably disconnected: 10054 - An existing connection was forcibly closed by the remote host”
I haven’t been able to find more info on it though.

What is with the lack of support, even for plex pass members these days?