Please check your head unit firmware version. There is an update available.
If you have a Non-Navigation unit, firmware version should read; Rel_U1.18.38.50
If not, take to Dealer and have them update. (Navigation units are able to download file and install from home)
Bluetooth volume:
If you are connected via Bluetooth and are listening to audio, the phones volume must be turned up to maximum. This will explain why you have to raise your head unit’s volume to 30 just to hear.