Sound drops in and out

Hi there!
Absolutely love Kodi 17 release, but having a problem with every show or movie audio dropping in and out every 20 seconds or so. It goes to very quiet to very loud but seldom stays in the right level. I have tried every setting I can possibly think of over the last two days but no luck. I have tried different HDMI chords and input and still not luck. I am currently running the following:

Leelbox MXQ pro 4K
Kodi 17 app
High quality HDMI chord direct input into TV
No sound system or receiver of any kind just TV speakers

It seems to only really drop out during talking parts in a movie or show.

Any help would be greatly appreciated!

Thanks!

Sean