GPS works only sometimes. If I reboot (which is annoying to have to do when you're driving!), then it comes back. I'm not using wi-fi calling, it's turned off. GPS Essentials shows something like 24 (GPS satellites) visible, 8 used in fix, no fix. The disturbing thing is the "no fix", even though it shows some number of satellites used in the fix. I can leave it my phone trying to get a fix, but it won't get one unless I reboot.What is messed up on the GPS on your Sprint M8?