Why does my voice sound like I'm talking underwater?

I am Amateur, live streaming with Restream for 2yr. I have never had a problem with sound out at the local park. But I used a new headset mic, and I sounded underwater for 1 hour. Suddenly, it said well, and the sound went normal; could the Bluetooth interfere? I was using a regular mic. I expressed underwater and deficient. Usually, it may be blurry with low data speeds, but I never had an issue with audio. Could it be internally adjusting to the new mic sounding slightly more bouncy or eco? I DON'T KNOW, BUT I DON'T WANT IT TO HAPPEN AGAIN. THE RECORDED VIDEO SOUDS GREAT. IS ONLY THE LIVE VIDEO THROUGH RESTREAM TO YOUTUBE? ANY IDEA ALL THEIR SETTINGS ARE BUILT IN? I HAD IT ON DEFAULT. THE ECHO CANCELATION BUTTON IS ON AS WELL. THANKS FOR YOUR HELP IN ADVANCE IF YOU HAVE ANY IDEAS. GOD BLESS.

[Mod note: moved to a thread of its own. And please don't write in CAPS - it makes the text very hard to read.]