I have not had the problem with turn signals, but after 7.0 as I've mentioned in a couple other threads, I did have my 17" become unresponsive, so I rebooted... I had one instance of Handles not responding to touch, but figured I'm a newbie and must have screwed-up, so pressed my FOB button twice and they presented. Then the Music player started acting up, including your symptom of Slacker not playing or not allowing any controls to be used.... I rebooted... Nav acted up with only partial displays in the 17" as i was sitting in my driveway, then when I shifted into reverse, the rear backup camera showing the bottom 1/4 of the visual at the top, and the rest below it -- all live -- that was odd. I had the 17" reboot itself while I was driving a few minutes later. Then strange things with receiving an incoming call from the same number after a minute or so when I'd open my door and get in the car, and when I pressed a button on 17" or IC to answer... Nothing there, and the message for the call would stay on the other display, but I found the number was actually a missed call from the day before on my iPhone6 running iOS 9.1 and there were no calls really coming through. I rebooted the IC and 17", then finally called support as some of these things kept occurring.
Net was, deleted my phone from the MS in Bluetooth settings. Delete the pairing info from the iPhone Settinga. Reboot the iPhone. Reboot the 17" if you have not already. Re-pair the iPhone with MS. ...and as odd as it is, I've not had a single "electronics" problem in several days now. As to how all that is connected, I don't have a clue. Support was sort of shocked with this as well... They said they saw some of my symptoms just after iPhone6 came out a year ago, but not since... I think it's all very, very, odd, but since I can't recreate this, and the problem went away after disconnecting and reconnecting my phone, well, it is what it is. JUST BE SURE you do all the steps above... Apparently fully deleting the phone/MS connection on both sides and those reboots are part of the trick.
Good Luck.