The concensus here is that there is some sort of conflict with the Russound software. I like to look for the unique thing that can be causing a problem and the Russound seems like a winner for that.

For everyone else reading this thread: Do you experience the problem being described?
Do you use the Russound software? If yes, are you having any issues with the MX700/800/850?

The only way to know this for certain would be to uninstall the Russound software and see if the problem persists. That is understandably a lot to ask, but since we aren't seeing the same problem here it makes the most sense. You can always reinstall the software afterwords and it may answer a few questions for you.

Jeff