For the guys who have the problem of GPS not locking, do the following:
Settings -> System -> Reset options -> Reset app preferences (this doesn't affect apps data)
Settings -> Apps & notifications -> See all XXX apps -> (3 dots in the upper right corner) -> Show system -> Clear storage and cache of the following apps:
Restart your phone.
This seem to have worked for me, but I am in my 2nd day using GPS so I am still trying. I do not know how it occurred as I know I didn't have this issue too.
OK, it has been just over a week using GPS and the above definately helped.
I also found out when I switched providers, it didn't do the coverage too well like the other provider I have in my other SIM tray which worked well.
I previously faced network and GPS issues.. it got so bad that it's really not usable to an extent....
Then I realized that a metal frame bumper that I bought basically kills it.
Do strip the phone naked and see if the issues still exist...