auto SetLootMethod

[EKE]

i'm trying make a addon for my guild because they almost always forget to change loot method in raid.

local frame = CreateFrame("Frame")
frame:RegisterEvent("GROUP_ROSTER_UPDATE")
local function eventHandler(self, event, ...)
    if IsInRaid() and UnitInRaid("player") and UnitIsGroupLeader("player") then
	if event == "GROUP_ROSTER_UPDATE" then
	if InGuildParty()
	then
          SetLootMethod("master", UnitName("player"))
	  print("master")
	else
	  SetLootMethod("freeforall")
	  print("free")
        end
        end
  end
end
frame:SetScript("OnEvent", eventHandler)

it can auto select loot method now, but it'll try to select every second never end

i think something wrong in code but dont know how to fix it, wrong event? which should i use?