Week 2 of Troubleshooting: TL:DR: toggling cell doesn't work anymore, toggling location repeatedly until gps locks apparently works.   Changing connection type from 5G -> LTE or LTE -> 5G does not work anymore. What has started working is toggling location settings. So far, it works 80% of the time per cycle, aka, I can keep on toggling the location until the GPS syncs up. This has worked for the last 3 days every time. Again, it's not 100%, but I can get the GPS to lock up when I need it with just a few button presses in the quick settings.   What I suspect is still something to do with a service that causes interruption with the GPS lock ability. Toggling location apparently does affect this service, rebooting and launching immediately into Maps still works, so there's a Samsung or Android service that is causing this issue. Maybe it's tied to hardware, but all I know is that however GPS locks positioning on a mobile device, it must occur in a small time range. I'm assuming a chip on the SOC that's in charge of GPS must perform an action in order to go from "Hey satellites, where are you?" to "Lock on to my position with said satellites". That action doesn't always work, as if when location is passively running for nearby location data, it has difficulty updating to actively running for accurate, >10m accuracy. The reason I think it has something to do with passive to active is that location will work perfectly when GPS is locked but requires reboots or antennae reboots in order to work aka it needs to be forced into active state because it fails to transition smoothly.    Interesting behaviors: when the GPS is failing to lock, there are multiple behaviors. 1. GPS will occassionally update periodically. It is pretty consistent how often it updates, feels like every 15-30 seconds. However, on some occasions, it locks every minute or even 5 minutes. But it's always consistent. For 2-3 seconds, it will perfectly monitor my speed and location, but then halt until the next update. 2. GPS will lock on to a nearby location where I've never been but was close to. If i'm driving down a highway, it will lock onto a culdesac .25 miles away from me and just stay there.  3. GPS will lock on perfectly to where I was but never update.  ... View more

To continue documenting this issue, I've come up with a workaround that has worked twice for me in the last two days:   Close all location requiring apps Change the connection type for data from 5G -> LTE or LTE -> 5G (doesn't seem to matter)(Update: doesn't work for me anymore, updates below on what now works) Immediately  open your location requiring application Temporary success until the location app is closed or goes into sleep   @samsung: The issue appears to be when GPS requiring applications go into the background, the handoff from background GPS to foreground GPS requirements doesn't mesh well with the cell antennae in the phones. The issue can be circumvented if the first application after the cell service is disabled is the location requiring application. There is an android/Samsung service that controls cellular that must be disabled while the GPS attempts to lock, but I cannot figure out which one it is specifically.  ... View more