So I recently purchased Oblivion for my 360 in Games on Demand, haven't played it in a long time and missed it. But while playing it I notice these constant hiccups or split second laggy motions that occur and a sort of laggy choppy-ness in combat. Is that just a byproduct of games on demand and I should get a hard copy again or is it just choppy in general and I don't remember it?