[SBAllan]

Just picked up a 2017 GLE400 4matic the end of December. I've noticed that my phone doesn't always hook up to the stereo. Is there a setting somewhere I am missing that tells the system primary and secondary phones and to auto join?

 

[greg house]

Sometimes it can be the phone, try going to a service, maybe they have the answers

 

[Jeorge]

I would suggest you go to your service as I had similar issue