Hi @TRT1968,
Welcome back to our Community Forums! Thank you for your post and I'm very sorry to hear that you're experiencing some issues with Film 4 sound at the moment.
Is this issue impacting any other channels at all? Is this issue happening on Live TV only, or on Catch-Up as well?
Have you been able to take a look at our TV Faults page to see if this can help identify your issue? Let us know how you get on so we can investigate further.
Thank you.