Android Auto and Apple CarPlay is just device mirroring apps which means they project whatever you see on your phone.
With that said, this Waze issue is mostly because of bad internet connection either on your phone or the Waze app when it goes through Android Auto.
Don't waste your time by going to a VW dealer.
Try re-installing Waze first. If that won't solve the issue, uninstall Android Auto on your phone and install it again.