I have this 3 year old ball python named Melvin who has always been a pretty passive snake but recently he has been biting me out of the blue. The most recent bite was last night after handling him for about 20 minutes. When he bit me he didn’t strike he just opened his mouth and sunk his teeth into my hand. I feed him about 36 hours prior to this so I don’t know if he could still be hungry. I feed him a medium rat every 2-3 weeks. If someone has an idea of why he is doing this the help would be greatly appreciated.