AVG Free is blocking my game sound

I have AVG Free installed and when i use the game Train simulator Classic via Steam it is blocking the game sound when i have AVG running. if i uninstall AVG Free the sound on the game works any idea how i can fix this ?

Hi James,

Thank you for contacting AVG Community.
We're glad to look into this & help you.
Appreciate your efforts in working towards fixing the issue. 
Please reinstall AVG Free Antivirus, disable each AVG components separately as mentioned in this article to identify the shield that is causing the issue & let us know to proceed further.

Hi James,

Thank you for contacting AVG Community.
We're glad to look into this & help you.
Appreciate your efforts in working towards fixing the issue. 
Please reinstall AVG Free Antivirus, disable each AVG components separately as mentioned in this article to identify the shield that is causing the issue & let us know to proceed further.