So I decided to take the dreamcast (I have 2 and both are the same) out and play a little gauntlet legends and after playing the game for about 5 minutes it turns off, doesn't reset just shuts down.
Now while waiting for my buddy I had the DC on for over 10 minutes just idling and it was fine. It was just when we played that the DC shuts off.
I went and looked at the pins and they're spotless and bent them to make better contact but still they just shut off after about 5 minutes.