I now know a couple of reasons why myapp on my iPhone is missing some of my journeys:
1. I also have myapp installed on my Android phone although I don’t think it has been running and I rarely have the phone in the car with me anyway.
2. The car might see the Android phone as the Bluetooth connection for data and therefore not see my iPhone.
My journey to and from Somerset did not register on my Android phone (with me for music) nor my iPhone. Later journeys have registered but I'm missing three days of motoring.
What I’d like to know is where has my trip information disappeared to and is it retrievable? My guess is no it isn’t!
If it works similar to the system on my Benz Chris then the simple answer will be that all trip data is stored on the vehicle. The only time you lose it is either the battery on the car has been removed or the cars software has either been reset or updated.
Previous trip data should still be available to download and done so once a two way bluetooth connection has been established.
What I would do is this:- whilst seated in the car pick up your iPhone and power it down using a hard reset
(phones previous to iPhone 7 & 7 Plus means press and hold BOTH the Power & Home buttons until you see the Apple Logo appear. If it's an iPhone 7 or 7 Plus then you press and hold BOTH the Power & Volume Down buttons again until the Apple Logo appears).
Now let the iPhone reboot.
Once it has completed turn Off Bluetooth then turn it back on again.
Finally, by looking at the iPhone's Settings App check the cars Bluetooth is showing as Connected.
If that is okay then run the MyPeugeot App and see if it picks up the missing trip data.