Buffalo Bills defensive end Von Miller was just suspended for four games ... after the NFL says he violated the league's Personal Conduct Policy.
Miller -- who won't be paid for the next month while on suspension -- will be eligible for reinstatement on October 28 ... following the team's matchup against the Seattle Seahawks.
While it's unclear exactly what led to the suspension of the 35-year-old future Hall of Famer, the punishment comes almost a year after authorities issued an arrest warrant for Miller for allegedly assaulting a pregnant woman -- later identified as his GF.