Hi,
We have the same Plex client version and I do not face buffering issue on my Leica VP which is also running VidaaOS.
But I previously had the same platform version as you (VidaaOS version 7.60) and I was facing near-permanent buffering issues with this one.
VidaaOS 9.01 solved the issue for me.
more details here : HiSense TV bug - Plex for vidaa - #28 by gozzima
