So, wiping the cache partition seems like it worked. I went through this process then rebooted the phone. After reboot, I checked volume and it's controlling media. I then launched the Smart Life app again and it controlled the in-call volume, but when I killed the app the volume buttons went back to controlling media. I'll be testing this for a few days to see if the issue comes back. But so far it's working as is. Thank you for this!!!
Good luck. Also in couple of day when you reply here, please use @mention name so I could see. I am using PC when I log in to this forum and regular replies don't have any notifications.
I just read the replies of how a new app could be causing this. I had an app called "go to webinar" that I had recently installed. I got rid of it and it seemed to fix the problem.