I am having issues with GPS activity apps such as Map my walk, Strava, and OS Maps when recording activities. They either don't work at all, or start working then shut off after a very short time unknowingly. As this happens on different apps it makes me wonder if there is something not set up quite right on my phone. Has anyone else had these issues, and if so what was the fix please? My mobile data and location services are switched on so that shouldn't be the cause of the problem.