Guys, can you please follow this simple test?
Go outside, where the GPS can track you.Dial *#9646633#, then go to location -> YGPS.
If in the blue "radar" there are many red dots, it means that the GPS is not working properly.
If there are green dots, then the GPS is fine and you should check if the app you use with GPS (i.e. Waze) is working correctly or not, as it may have some issues.
Please report back