QUOTE(opjust @ Apr 3 2018, 02:37 PM)
Same issue with me, 6s on 11.2.6... I though my GPS got issue and really wanted to change the phone...
sorry to hear that youre suffering the same problem as I was. Did you manage to get it fixed? what i did was I ended up backing up and restoring my phone and it works ok now on ios 11.3