Hm. I am not sure. What are the rules you're running? In the errors, I see a Waiting for response timed out (setVolume) which is not functionality that is built into the app. I wonder if something is going wrong with the RM rule(s).
For Google speakers, you have to remember that you can only setVolume after something is playing. So perhaps putting in a delay might help? Not sure...
Edit: I've published v3.2 with these changes and HPM support, so you shouldn't have to manually update the app anymore.