I had an RROD in 2007. It happened once then it turned back on. After a couple of days, it happened again.
So, for a couple of weeks it would give me the RROD and then work again after a while.
After those 2 weeks, it gave the RROD again and that time it didnt come back from the dead.
So, maybe yours is beginning that process.
Didnt want to scare you, but oh well. 
Sorry 









