Bloomberg: New England Patriots owner Robert Kraft has resigned from the board of Viacom, saying he had too many other obligations to remain a director of the struggling media company controlled by Sumner Redstone. “Obligations elsewhere had increased to the extent that he no longer felt capable of fulfilling his duties,” Viacom said in a regulatory filing. Kraft’s departure, which took effect Aug. 5, came amid a selloff of media stocks, as investors reassess the health of the cable-TV industry. Viacom, owner of MTV, Comedy Central and Nickelodeon, lost 20% of its value this week. Kraft is contending with the fallout related to a National Football League investigation of the Patriots’ use of under-inflated footballs.