You have entered too many instances recently..

Hai ;)

I'm leveling 4 shamans with one of my Beeqs. Doing instance boosting without raf.
Recently I've had an issue with the 5 instances per hour limit.

Let's say I haven't logged like for 10 hours. Then I log five toons and start running Mana-Tombs as they are now.
I clear the instance 4 times, of course resetting it after each clear. Then one of my shamans gets a message that she have entered too many instances recently, while the others can enter to fresh instance.

Could this be some sort of a bug in the game or what's going on? After all, I enter and leave instances equal amount on my all toons, just one gets the message and therefore can't enter :F

Happened to me as well. I never could figure out what was causing it.

I would occasionally get the same thing with my Mages (so this was last year, I don't WoW any more) - I'd be repeating a dungeon and on the Xth instance 4 of the 5 would get in but one of them would get the "too many" error.
Never got to the bottom of it, just took it as a hint to make a coffee :)

Happens to me also. I'm finishing up my raf this week.

Another thing to keep in mind is that the timer works by wow license, not per character.

Happened to me too recently. I think the common denominator in all this is log out.