This happened to my friends. It's a precursor to the rrod or it is the rrod or something like that. Thir xbox was messed up so they reset it and it went back to normal
Put it in the microwave for 12 sessions of 5 sec. at 100% with intervals of 1 sec. in between each session with a damp towel wrapped around it at all times. Should work fine after.
You need to create a way for the heat to escape, so drill holes all over the xbox. If that doesnt work, take it apart and put it back together inside out