Something you might consider is giving the players more diagnostic and repair abilities via the /slash commands when it comes to comms. Right now the /voice diagnostics and /voice fix seems like the commands do nothing. With very little logging or visual output of voice connection status, there isn't much to empower us to give you any more detailed reports...we can't give you information you keep away from us.
There should be additional slash command to reset voice comms, and re-establish the connection. There should also be a slash command that allows us to verify the connection is working, and we the channels are properly connected.
Help us Help you, give us the tools to work with.