@Pickingausernameistricky
Honestly love, these things don't 'come out of nowhere'. When the dust settles it always transpires that there has been 'something' that preceded it or 'something' that's prevented it from happening before
In my situation, when I took a hard look at my marriage I saw that I walked on eggshells around exH to avoid his outbursts.It was so second nature that I didn't think about it and didn't notice doing it. But subconsciously, I 'sniffed the air' for his mood the moment he walked in a room. And all was rosy until I said or did the 'wrong thing' so I watched my words and my 'actions', again subconsciously. It was like, IDK, you don't think "Don't touch the hot stove", yet you don't. So, my advice is to find a quiet spot and give your relationship a think. Be brutally honest with yourself. What was true for me may or may not be true for you. But it's worth doing the 'process of elimination' that quiet reflection may bring.
And this is NO excuse, because there aren't any, but could your 'sarcastic noise' be something that happens a little too often or is upsetting to him? Has he ever said anything to indicate that he doesn't appreciate it? Again, there is no excuse for hitting and this is not 'victim blaming'. But we need to be aware of our own actions. But if he hasn't used his words to tell you he doesn't like it, that is his own fault and, again, no excuse.
And sure, he's apologetic. They generally are. Most abusers realize when they've gone too far and do what's needed to keep you there. New 'victims' are hard to find and hard to train.
A PP mentioned upthread that once it starts, it never stops. I agree for the most part. It will be up to you as to whether or not you figure out a root cause and whether or not it can be dealt with through therapy or counseling.