...or the GPS constellation hiccups.
...or an "undocumented feature" is discovered by hackers.
...or a virus enters the car OS.
...or an unavoidable update is found to require an immediate patch.
...or an X-Class X25 solar flare arrives as an unscheduled operational test.
I learned that the new electric meter installed on my home is "remotely accessible" and can, therefore, be turned off/on off-site by the electric company. And hackers.