After much tinkering and investigating i think the MYTVOnline app is potentially the cause of my buffering issues.
First i increased buffer to 10 seconds. Ensured HLS Start Mode was set to Normal (been searching these forums). I run my vpn client on my router with no issues. set static ip address on box and router.
My connection speed is more than ample whether connected to vpn or not, buffering happens whether i'm connected to vpn or not. Been in contact with provider, I can change the streaming server i am connected to via my iptv provider account which i have done and tried, closest to me. My next step was install kodi on z7+ then install simple pvr client addon. When streaming via Kodi i get no buffering but switch back to MYTVOnline app and for some reason it causes excessive buffering intermittently and regulary, tried factory and software reset (twice).
Just wondering is there possible an issue with the app ? anyone else having same issues ? any help/advice/recommendations very welcome.