Latest update to app rendered it useless – Control4 for OS 2 Review

Have been using Control4 app on my iPhone for years. After latest app update, I can no longer use it. When I attempt to turn on my 4 zone matrix amp using the app, it comes on, but with the volume muted. I can adjust volume level, but cannot deselect speaker mute, thereby rendering the amp useless. When I unplug the amp and reset it, the app will work with the amp for about a day. The next day, it turns on - again - in a muted state until I once again unplug and reset the amp. My audio installer replaced the amp to no avail. The problem still exists.
Review by Sluggo999 on Control4 for OS 2.