Re: WK 2012 GC - Iphone6 partially works
It's an ios8 issue.
I have 3 Apple devices (2 phones and an iPad) and the phone on ios8 does what you have described across two vehicles now (previous Mazda CX-9 GT) and now the jeep. The iPhone on ios7 does not do this (and nor did the iPhone on ios8 immediately prior to updating to ios8)
To troubleshoot the phone I would recommend reloading the iOS from a PC from scratch, that's what apple tech has advised me to do because I had updated via wifi and now have these bugs (I mean, cmon, it can't even play song properly, and they invented the iPod FFS).
If I play around with ios8, this happens regularly, more often on Bluetooth..
Hope this helps (all I'm saying is don't panic, it's not your jeep, it's ios8)
Sent from my iPhone using JeepGarage
MY15 Grand Cherokee 3.0L diesel, Limited, white, luxury group II.
Build date AUG2014, complied OCT2014 Australia, purchased new Feb2015.