This has been happening to me all through the summer and it’s now beyond a joke. Like others have reported, Zwift will crash almost always on startup - even before the login screen. When it gets through login and when you’re then just about to start an activity it will often crash again. I gave up on it today and reverted to a Trainer Road workout on my iPad without any issues - so I at least know the turbo is working fine. Yes, I do a full reboot every time.