Hello, I’m sorry I cannot help with your problem but I can help you improve your chances of getting help from someone qualified on this matter. 
First of all you should always specify the exact version of your player (i.e 7.23.0.12902 for me) and server (i.e 1.18.0.1913 for me) and not “latest beta at this day” because during testing periods there could be a new beta version released every few day (the 2nd, 7th, and 9th of october for instance) and it could hard to keep track of every single one of them, even for the plex team, and next because it will be faster and easier for them to not have to compare the date of the post with the releases dates to find the one you’re talking about.
Secondly the problem you quoted on the other thread doesn’t seem to produce the same symptoms as this one, and considering that this is a new thread regarding a entirely new problem, I encourage you to systematically take 5 sec after the bug to save the log to your device/cloud (OneDrive, GoogleDrive, Dropbox) and later add the logs you seem relevant.
I merely explained some things found in this link How to get Help in the Forums someone pointed out to me.
All of this to help them to try and diagnose your problem.
Hope that was helpful and that someone will quickly come and help you.
