I hadn't had the Carplay over USB connection issue for several months - I thought my new cable might have been the solution. Then, with the recent cold weather here in Calgary (-15C or so, not really that bad) I've had the on/off/on/off cycling problem the last 2 days in the morning. No issue driving home yesterday though.
Here's the symptoms: I plug in the phone. Carplay never connects (at least nothing is shown on the Sync3 display nor the phone). The "charging" lightning bolt will come on for about 3 seconds or so, then go off for a few seconds. This repeats ad nauseum. Yesterday I tried shutting down completely (opening the door) but it didn't help. Bluetooth works fine (I don't have the dropping issue others have seen).
It's possible this is an Apple problem, not a Ford problem (or both). For instance, although I have an older phone so this might not help, there was an IOS update today that mentions CarPlay stability:
https://www.carplaylife.com/news/apple-carplay-disconnects-from-iphone-ios-update-fix-releases/
Yep, that's the same situation I have. To get it to correct, you have to shut down, get out, lock the door, wait for the vehicle to completely turn off (dome lights off), then get back in and fire it up again. At least that's what I have to do.
Instead of doing all that, when the problem does occur, I go into the Sync settings and turn off CarPlay. That will stop the power cycling issue and my phone will charge as normal for the duration of the ride.
BUT, if I then use the Sync Nav (because CarPlay is now off) the "no GPS" icon shows up on the Nav map. So whatever the glitch is, it disables the in-car GPS for the duration of the ride.
My
suspicion is (although some on here have called BS) is that when CarPlay is on, the truck disables the on-board GPS and CarPlay uses the phone's GPS instead. So when the truck
tries to hook up to CarPlay, fails, and I manually disable CarPlay, the truck never turns the on-board GPS back on because it still thinks CarPlay is running. Or something. But whatever it is, when CarPlay fails to start and has to be shut down, the truck's GPS doesn't work.
I have not tried to manually shut down CarPlay when it's working to see if the on-board GPS then works or if the case is that once the truck hands off navigation duties to CarPlay (either successfully or unsuccessfully) the on-board GPS is disabled for the duration.
Who knows.