I often hear an unwanted buzz in between when I lift my fingers off the strings to change chords. This doesn't happen when I practice without switching chords. I recently replaced my high E string so that could possibly be the issue but it's probably my technique that's the problem.
yeah its your technique you release the pressure from the strings too slowly so that it buzzes
instead of muting the string when you lift it off
The more you practice the faster you get at chord changes and it eventually goes away.
if theres any buzzing when your fingers are on the strings you might need to press them down harder or get your action adjusted
I'm already changing between A and D moderately quickly but I still get some buzzing. I don't even have to think about where my left fingers should go. I hope I'm super close.