In 1988, Montana threw eleven interceptions in nine out of 17 games, missing two regular season games. He threw three interceptions in a loss to the Falcons during the regular season and an interception in the 49ers win in their Vikings playoff game.
Montana missed three regular season games and threw eight interceptions in six of those games, while staying perfect in three postseason victories.
In 1990, Montana threw 16 interceptions in eleven out of 15 regular season games, including three straight games where he threw two interceptions each outing. There's also his three interception game during a Rams loss. He also threw an interception in the 49ers playoff victory over Washington (the 49ers lost to the Giants the following week).
You should feel fortunate. Montana missed seven games during that stretch. He was perfect in less than half of his remaining games (22) that he didn't throw at least one interception. 22 out of 50 games. Interesting.