My Flash Player stops loading and playing half way through - Help!

Hi

On my Chrome AND Firefox browsers for Windows 10 (flash player 21,0,0,216 installed on Chrome) each time i watch a particular video, the buffer or loading gets to about half way through before it skips to the end and subsequently the video only plays half way.

I have tried

- Cleared my web browsers cache and history

- Removed all websites in to flash player storage settings panel

- Restarted my computer/ browser/ modem,

- Uninstalling and reinstalling flash

- Tried to increase the global storage settings (will not save)

- Contacted the website of the video and they confirmed there is no issues on there end and to rub salt on the wound sent a print screen of the video past 50%

- The website even gave me another log in to try however it still didn't work

I would appreciated anyone's help, thanks in advance and good luck.