When matter is converted into energy does it lose its gravity effect? I would think if some process inside a black hole converted enough of its mass temporarily into gravity-free energy, the black hole would explode in a big bang.
The theoretical black hole still has nuclear processes going on, it's just too massive for light to escape. X-ray emissions come from (
it sez here) about three times the distance of the event horizon. The type and amount of matter-to-energy conversion probably has something to do with (in theory) whether and when a black hole goes kablooey. Fission reactions (on the heavy side) and fusion reactions (on the lighter side) all converge on Iron, which is the eventual (theoretical) destination of all matter.