Does he have carpet and if he does, does he leave it on carpet because that will overheat.
It couldnt be a newer one because they remade them and none of the new ones do it anymore i had mine for a year then it had red ring of death and then i sent it back for 30 long days and i got a new one and it hasnt done it for 2 years because im being alot more careful with this one.
Microsoft has a guide on how to fix this but if all fail then just send it back for a month or so. Heres the guide hope it helps
Xbox 360: Two red lights flash on the Ring of Light.