Audio problem random

Hello! I have osmc tv installed on RPI2.
When I played more video audio drop down and I listen a dirty sound impossible to understand.
The problem was solved if I reconnect the HDMI cable to RPI or TV or if I restart RPI2.

There is a way to solve finally the problem?

PS sorry for my English…

Do any of these help?
http://kodi.wiki/view/Raspberry_Pi_FAQ#Audio_or_video_dropouts_on_HDMI

Tried a different HDMI cable?