During the tour for all zwift I got shot off the course at over 100 kmph and the screen when black. The ride still saved but I couldn’t refresh and rejoin the course. The data did save and upload. The only reason I know the speed is because the badge. The power out and cadence from the trainer was reading properly from what I knotices.
you found the wormhole?
Check if you got the 100KPH badge…
(see here)
That bug should have been fixed at the end of April with all those updates Zwift pushed out. Make sure you are on the most up to date version.