Do you lose your prestige class features when you no longer meet its requirements?

Certain prestige classes detail a list of requirements that are possible for the player to lose (alignment, casting at a certain level), but not what happens if you no longer meet those requirements (acting in an opposed way to your alignment, suffereing from energy drain). Some classes and prestige classes do detail what happens if you no longer meet your requirements, but not all do so.

So I am asking: if you no longer meet the requirements of your prestige class by choice or external influences, will you lose the class features gained from it, despite this loss not being detailed in the class itself?