I've had 1940 for almost 2 weeks and not had a random restart like on 1899. I wouldn't say the response is any better though. It's never Tesla infotainment or 90-120hz phone fast that it should be in this era.
Unfortunately they could not fix my SOS module on the first service and it's going back for another fix attempt soon. I think, the main cause of the "changing your vehicle settings" is because something was modified on your cloud profile, (especially through the connect app) and it can be something as little as a previous destination change. The onboard modem is slow, and so when it eventually finishes syncing it will apply the changes. Possibly being on WiFi helps alleviate this somewhat but it's a small time period to do the sync if you immediately leave your driveway after starting the engine, the system is still busy booting for minutes. Without doubt, the always online nature of the internet connectivity it's the main culprit.