I dont know is it only a revenant problem or any other class affected, but on open field it happens in every minutes. Example: downed player on the ground and i cant hit it with aa, not even if i stand near to it. Hammer#2 hits. It happens with sword#2 as well.
WSR→Piken→Deso→Piken→FSP→Deso
Just the WvW
R3200+