BLOWUP: jak tam mohl být ještě včera, když to bylo postnutý před 11 hodinama? :)
Tl;Dr:
Cruise control did turn off. What you thought was cruise control was actually just the car coasting. It's hard to tell because your screen had crashed (that's why the speed wasn't changing at all). Note that coasting will feel like cruise for a short while if you're used to regen braking.
When the center screen crashes, it has no influence on the autopilot and cruise control systems. Those will disable with the press of the brake no matter what the hell the center screen is doing (even if it is missing entirely).