iPhone 4 Spotify unusable with BMW iDrive - iPhone unresponsive

[spotty23]

Steps to reproduce the issue:

• Power on car
• Plug iPhone into car using USB cable
• See Spotify automatically start on iPhone
• Wait for Spotify option to appear in multimedia section on iDrive (10 second pause before it appears)
• Select Spotify on iDrive and start it - note Spotify on iPhone appears to freeze (becomes unresponsive to input). Not sure if this is intended as I've never had it work correctly.
• Generic BMW multimedia application screen shown for just under 30 seconds before spotify logos are overlayed on the screen.
• Choice of 'Your Library' and 'Browse' available. Select library
• Nothing further happens, stopped timing after 4 minutes.

What steps you’ve tried already:

• Uninstall/Reinstall Spotify on iPhone
• Restart iPhone
• Installed Deezer (to rule out iPhone/iDrive/cable). It loads instantly (no 30 sec delay as screen is painted) and no playback issues.
• Note this phone was recently factory reset (I got it just to use for spotify in the car)

Your device and operating system : iPhone 4, iOS 7.1.2

Type of Spotify account you have (Free or Premium): Premium

The app version of Spotify you’re using: 5.7.0.1055

                      New 2 series car, latest software (001.050.002).

[spotty23]

Any suggestions? I'd rather stay with spotify than jump to Deezer