So the GPS in my 2016 GT doesn't seem to be working. I rarely use it, cause I rely on Waze, and I've never updated anything, but it doesn't seem to be a navigation software issue, but rather that the GPS isn't registering where I am at all. It shows me in my driveway all the time. Any idea where to start to diagnose the problem? Even though I don't use it very often, and its pretty awful anyway compared to Waze, I'd like to have it working as a backup.