Sound issue but just on Channel 5. Advice please

[Joshbear11]

Hi all,

I have a Sky Q box connected to a sonos Arc, Sub and surrounds.   All works well apart from programs on channel 5.  So for example I am sat watching Police Interceptors (No Judging pls 🙂 ) and the surround sound is working fine then all of a sudden it stops during the "Action" scenes but comes back for the narration in between.  

This is the only channel this happens on (As far as I know).  Does anyone know how to fix this?

thanks

Josh