So it’s not just my phone!
I have the same problem with the GPS on my FP1, since about ten days. I’m also with Drei in Austria, and I have all access to GPS turned off on the phone, in settings, in camera, on all apps where possible, and the time is set to network not GPS.
Still whenever I access my network internet, the GPS turns itself on and stays on until I manually turn it off.
I haven’t recently added any apps, but I did disable Google news.
would love to hear if there is a solution to this!