There are many different versions of the snap in.
Try to get 390-04 (Hardware 3.0) if you can. This is the newest and best one. It's what I use.
There is also a 390-03 (Hardware 2.0) which appears to work most of the time but wouldn't work in my car other than for charging and playing music. No connected drive.
Before that was 390-02 and below, these are prone to problems and I don't think have the fan in the middle like the newer models.