Volume goes down by itself

After updating my Zoom to Windos Version: 5.11.1 (6602) and using the English-Spanish intepretation channel to speak (to interpret in a meeting), my sound volume drops gradually to the point of even being almost muted. My interpreter colleagues were all OK, it only happened in my channel. I am using a Sennheiser SC165-Jack3,5  headset. It had never happened to me before and I was thinking if it could be due to the software updating, Could anyone help me to fix this?