Please tell us some basic information before asking for help:
Model Name: Rog phone 2
Firmware Version: 17.0240.2009.49
Rooted or not: Not
Frequency of Occurrence: GPS doesn't work.
APP Name & APP Version (If your issue relates to the app): Google map
In addition to information above, please also provide as much details as you can, e.g., using scenario, what troubleshooting you've already done, screenshot, etc.
When I opened Google map, it said GPS signal lost. I tried to factory reset my phone already but it still doesn't work.