OK so this is the latest and greatest. After troubleshooting with Apple and their "Geniuses" on three different iPhone 7's, thinking that was the problem, we tried it on a iPhone 8. the Waze problems persisted. Simultaneously I worked with the Waze technicians setting and toggling and resetting uninstalling and reinstalling without any success. However I did notice that my Waze app works perfectly in my wife's car and in my daughters car even after all of the iPhone iOS updates (11.1.1). I've taken three UBER's since and the phone & Waze worked perfectly in all the other vehicles. Finally I took it into the dealership and had the technicians turn on Waze on all their iPhones and test before getting in my truck. Then I had them get in my 2018 Yukon Denali with me & drive around. Guess what.... All of their phones GPS's started to malfunction and not just using Waze, but Google Maps too. We all troubleshot with Bluetooth and Wi-Fi turning them both on and off, but nothing corrected it until we got out of the vehicle and turned it off. Then Waze & GPS worked again on all our phones perfectly. We believe it has something to do with the cars internal Wi-Fi hotspot which I am currently having disabled for my road trip this week. I'll keep ya'll posted!