can you provide more details
which app are you trying to cast?
What type of device are you casting too?
Are you using a chromecast or built in cast prorgram?
Any external speakers?
As much detail as possible and I can help you out!
and you are noticing this on all apps spotify, crave, youtube where the audio is cutting out?
You mentioned the sound cuts off from both devices, is it audio coming out of our TV and your A8?