Since updating Windows last night (KB5006363 & KB5007215) Zwift now exits mid-ride after a seemingly random period of time.
I logged in this morning and started a ride with Coco; after about 5 minutes Zwift just exited.
I logged in a second time and rejoined Coco - with the same thing happening after ~7 minutes.
I rebooted my computer and then tried a third time. I spent ~30 minutes riding around London outside of a group ride, before the game crashed again.
I’ve checked the event log, there are no exceptions being logged - nor is there anything of interest in the various log files inside the Zwift folder.