-I thought it was my keyboard it's self 'Reclusa' NO
-I thought it was the program I was using (firefox) nope happens in chrome and other apps NO
-Thought it was a setting in the recording devices, that automatically adjust the volume of programs to favor microphone and live chat apps. NO

Yet still in Windows 10 I unpredictably see the volume meter show up on the top left of my monitor automatically reducing by roughly 4 degrees. The only thing I'll be doing is scrolling a page or game with the 'page down' button on my keyboard. This does not happen, every time I press the 'page down' key. Though again when it does happen I catch it while touching briefly the 'page down' key.

Thanks to anyone who can help.