I only just got Red Dead Redemption Undead Nightmare stand alone game from the PS store and the bugs i've encountered have required me to reload from the last save file for every mission because trying to do another mission or save a town from zombies without saving and reloading won't let the mission be completed.. and for saving a town, the zombies all became headless and armless normal people that still register as enemies despite walking a talking like normal people.. except them mission their heads and arms of course. i know the game is notorious for bugs and glitches. but the game is almost unplayable if i have to save and reload between every mission and activity.. is this because of me using cheat codes or is these common bugs that happen a lot?