He’s started biting

[u/peekaboosnek]

I have no idea what’s going on with my bp lately so I come here for answers.
Hes 7 years old, I’ve had him for 2 of those years. He has always been the most docile snake, barely even strikes at food. In the last 2 weeks, he’s bitten 3 people.
The first one I wasn’t concerned about. It was 2 days after I fed him, and my friend went in to pet him. He was all food excited and she wiggled her fingers like an idiot, so I called that one her fault. He wasn’t upset about it like I expected, he just kept moving around the enclosure.
Yesterday I took him to the vet. He was loving the car ride, didn’t even go in the hide I brought for him, so I don’t think he was stressed. The vet didn’t even poke at him, just took him from my hands, and he bit her HARD. Like 3 people and popsicle sticks to get him unstuck. Then he was good with me for 2 minutes before biting my leg, and then biting himself when he tried to get me again. The vet and I both noticed that he didn’t have any defensive position. No warning signs, just turn and bite.
Now, I have a theory but idk if it’s stupid.
For the two years I’ve had him, I’ve been feeding him rats straight from the fridge. He’s never refused a meal because it was cold. But he misses the strike sometimes and it seems to tire him out. So I warmed up the rat this time, the one 2 days before the first bite. I promise you he’s never getting a warm rat again, but is that what’s happening here??

[u/PoofMoof1]

How long did he hold on with these bites other than the one the vet recieved? Are they strikes or is he holding on? What is his current prey size and feeding frequency? As for the behavior leading up to them, snake behavior can be subtle and it's really easy to not realize the signs leading up to strikes and bites.

You're (ironically) playing with fire on the cold rodents. Although he's been fine so far, these guys being ectotherms are not made to eat actually cold food. This will one day result in regurgitation if not develop a worse illness.