I'm a delivery specialist for
I'm a delivery specialist for Subaru and we've seen this issue pop up on specific phones. The solution that works as close to 100% from what we've found is actually a phone setting.
Make sure the phone is NOT connected to the in-car USB. On your phone, go to Settings>Connections>More Connection Settings and click on Mirrorlink in that list. Next, plug the phone into a direct USB connection in the car. Now you should have the option to click OFF where it says "Connect to vehicle via USB" and once this is set to OFF the issue should be eliminated.
Mirrorlink is an older, pretty much outdated, app originally designed to work like Android AutoPlay or Apple's CarPlay. However, it didn't catch on well here in the U.S., primarily due to the rapid update rate on most cell phones; the changes in operating systems (not to mention firmware) for Android alone outpaced the ability of the more static system in the vehicle to keep up. I believe the only device now even capable of syncing with Mirrorlink is Galaxy 3 running Ice Cream Sandwich OS, which places it roughly pre-2012 - aka ancient, in terms of technology!