App Location settings constantly changing from "Always," to "While Using."
I've been using a tracking application called "FollowMee" for years and it has worked flawlessly.
A few months ago, my wife and I upgraded our iPhones because of the 3G switch over. My new iPhone XS works great with the app.
My wife's iPhone 7plus keeps switching the app from "Always" to "While Using." If she doesn't check it, the app won't track.
The app people claim it is a new feature of the operating system. This doesn't make sense, since both phones are using 15.3.1 and my phone doesn't switch and hers switches all the time.
I've tried several fixes from the internet, but nothing seems to help. I've even tried locking location settings so they can't be changed, but they change anyway, and then I have to unlock the phone to change it to the correct setting. I'm even considering buying her a new phone, but since I don't know the cause of the problem, I'm afraid that even that won't fix the problem.
Any ideas?
iPhone XS, iOS 15