[ragunragun]

I figured it out!

local noloadingscreen = true
local function OnEvent(self, event, isInitialLogin, isReloadingUi)
    if isInitialLogin or isReloadingUi then
    else
            noloadingscreen = nil
        C_Timer.After(2, function()
            noloadingscreen = true
        end)
    end
end
 
 
 
            if subevent == "SPELL_AURA_APPLIED" and destGUID == playerGUID and noloadingscreen == true then
                    a:SetTimer("buffup", 1)
                    a.Sound(SoundPackValue("buff_on_self"))
            end

Did the job.