Plex has become very buggy

Hi guys
I’m not a techy person so I will explain as best I can.

First off I want to mention Plex and windows 10 have installed a few updates in last couple of months and now my media won’t resume and some won’t even play so have to start from the beginning and skip my way to where I left off. Seems to be only affecting newer stuff I’ve added.
I’m running up to date Plex server on windows 10 pc and Amazon fire TV running Plex to play I assume the Amazon fire TV app auto updates I never get any notifications

Any help will be appreciated let me know if you need any more details.

Thanks