Hi.
As I promise, whole day I am trying to reproduce condition which return settings in default state but without success. On my opinion this is related for background update of live tile (background task). I beleive that my setting was set it up to update live tile each 10 minutes and I remember that I have some alert related for your app.
In the mean time, while I am trying to reproduce condition, I am disable background of live tile from WP - Settings - Application - Background Task -Battery Status. After that action I cannot access to setting page of app it self, moreover, when I try to access setting page, app it self crash.
This apply for both condition, check in or not check in option from background task setting, to turn on BT and not to turn on.
That is.
App it self is great, on my opinion one of must have app on the phone.
Cheers.