Tvheadend

My current setup:

Back-end :

Rpi 4 with Latest version of Tvheadend on Libreelec, using Pi's Tv head. Configured to use Pass streaming profile

Front-end

Nvidia Shield using PVR Live application to pull in TV channels into Live Channels app.

My issue

Some HD channels (BBC 1 or ITV) will sometimes sit on loading and wont display, i can see a live subscription for that particular channel on TVheadend server with number for Input/output changing. Appears to happen with channels that broadcast 5.1 sounds for what i have gathered.

Tried a few different applications that pull channels into Live channels and same outcome, playing a problematic channels on vlc works however.

I am based in UK if that helps.

Any help if highly appreciated.