I noticed something odd on my guest map today. For no apparent reason, several entries have disappeared. There were flags in places a while back that are now gone, and I've no idea why this is happening to some and not all of them.
At first I thought that maybe after a certain amount of time the system dropped them off, but then I noticed that some of the original flags set are still in place.
It must be sun spots. That seems as good of a thing as any to blame it on. Either that or Steve's ghost has been coming in and erasing them.
I'm going with the sunspots theory.