Always love the "other apps" argument.
The issue has a randomness to it, and just because you're seeing it with app A and not app B does not mean it only ever happens with app A and never with app B.
Please do take a look at the FAQ, search the page for "mobile radio active" (or just "mobile") and enjoy the screenshots of this issue from: Google Play Services, Gmail, Facebook, Google+. There are plenty of screenshots from other apps on the Internet, easy to find.
The bug report can also be very educational:
https://code.google.com/p/android/issues/detail?id=165558And this is a new bug someone opened just to track this in Marshmallow (yes, it's present there too):
https://code.google.com/p/android/issues/detail?id=190396Has screenshots of Google Now, Facebook, Chrome, and TouchDown HD (a mail app, not that the type of app matters at all).