Can you explain it a bit better?
Right now it sounds like you're just belching. But you are keeping your mouth shut while you burp and so the noise sounds like its coming from your chest instead of your mouth. You will get shortness of breath doing that because your diaphragm is trying to make you burp but you wont let yourself do that, so that is going to disrupt it for a bit.
I've had those before when I've had small burps that dont force me to open the mouth. They can hurt but they aren't a medical issue
Unless there's more to it than that, but I don't know because you haven't explained it clearly