Hello I'm retrodoctor I recently started playing retro games I opted for a retro duo over the original systems due to price. However my problem I have is some of my NES games (1943,Super Mario Bros, warriors and wizards and robo warrior) I bought them used from a game store Mario and 1943 work however between stages the game goes out and I loose sound and video for a few seconds. Wizards and warriors the same but gives out occasionally. I play other nes games fine like N.A.R.C and double dragon but those are giving me trouble is this caused by the game or system?