Instructions:
Download and install the latest ReClock (v1.8.8.5).
Run the 'Configure Reclock' shortcut on the desktop and on the Audio tab at the bottom check: Accept bitstream formats. (everything else can be left on defaults)
In MP2 menus go to Settings -> Players -> Codecs -> Audio Renderer -> Audio Renderer -> check: ReClock Audio Renderer
I also had sync issues with my new TV, i figured it was because of the RefreshRateChanger plugin. Apperantly the TV didn't always set the right refresh rate.
Since I disabled it (removed RefreshRateChanger folder from Team MediaPortal\MP2-Client\Plugins (in program files by default)) there are no issues at all.
Maybe try that?
I have tried reclock and it works most of the time. It is frustrating as I used the previous version with none of these issue, albeit on slightly different PC hardware and win 7 not 10. Watched 3 programmes the other night and got to an episode of Big Bang theory and it was out of sync all the time!
Will take a look at this latest option, but the tv isn't new, 2009 HD model.