A lot of electrical devices today have a switch of some kind to deactivate the device after a certain period of time. Sometimes the device just gets annoyingly slow. In any case, it is implemented in software on that device. And the reason for that is Planned Obsolescence. Forcing the user to throw away this device and buy a new one.
This comment thread is for people to document various implementations of this malicious feature.
Spaghetti code! The insidious thing that often happens even to the best of us. No wander that it happened to me. When programming you want to break your code into functions that could be called from many other places. Doing everything as one large function is a problem, because sometimes you might want to do the same operation or the same check, or whatever, again in another place, and that will require you to copy paste large chunks of code. And if suddenly you decide to change something about those checks, or functions, you have to change that something in all those places one after another. Dani's Race my game, has a bit of a Spaghetti code problem.