'''Slightly off subject but useful'''
With the new lollipop update i have seen alot of people having ringer volume issues so i hope i can help as my Moto g 2nd Gen had the same problem and it's running ok for now......
You are going to need to plug your phone into a computer and on AUTO PLAY click "OPEN FOLDER TO VIEW FILES".
1) Go to Media folder > Audio > Ringtones
2) Copy all ringtones and go back 3 tabs to the main storage page of your phone
3) Open Ringtones folder and paste your ringtones
4) Close the window, unplug your phone and cross your fingers it has solved your problem.
Worked for me so i hope this helps others.
Good luck