Hello Itssid, what mac did you use when you ran aireplay. if you change your mac to match that one, then you wont get the message. for example if you used aireplay-ng -1 0 -e [AP NAME] -a [AP MAC] -h 00:11:22:33:44:55 wlan0, then you want to do this first.
macchanger --mac 00:11:22:33:44:55 wlan0
wlan0 or what ever your device is.
i had a fragmentation attack going on one of my routers and not 1 interesting packet after an hour. so yah, it really could take that long for some routers.
hope this helps ya.