Giving up is also a security feature. Whats more likely? your system clock sped up by a factor of 2 and everything kept working, or some guy on your network is

Giving up is also a security feature. Whats more likely? your system clock sped up by a factor of 2 and everything kept working, or some guy on your network is trying to dork around with your time so he can bypass some time limited authentication? Of course, the software needs to correctly handle cases like suspend where the time may honestly need to step. If it doesn't thats a short coming of the software, not a reason to eagerly make "presumed impossible" leaps just because some unauthenticated packets on the network tell you to.