I have a stable, rock solid home WiFi setup with the trainer and Zwift device about 3-meters from my WiFi router.
I’ve had “Connection Disconnected” errors several times during the Tour de Zwift which indicates a server connection error: Split the (new) Connection Failure message - #4 by Dean
I can only assume it’s something on Zwift’s end, not mine - and there enough reports of similar during the TdZ to support this. Never happens to me other times of the year.