You may want to try checking your source volume, as in, the volume of your smartphone. Mine occasionally goes to a default volume, lower than what it was, once it connects to the car or a new app is opened.When my iphone is running the Cross Connect app, the radio volume is slightly lowered. Only when the phone is 'locked' or not connected to Cross Connect app the volume is normal.
Why is this? is there a setting for this?
Increase the volume directly with your phone to give the cc app/head unit a stronger audio feed.