Hacking attempt detected? help

hey dave/mcsic i always get an error when i login after 3 minutes it says "hacking attempt detected, disabling connection to server" then it keeps popping back up when i press okay so i have to restart the launcher just for it to happen again. i dont have any hacking programs ive never downloaded any for f gunz and i dont have any period. neither do i have anything running in the background while im playing. not even stuff hiding in the bottom right corner that are open. i even checked my processes. nothing. please help? i cant play now cuz of it