sound issues on zoom meetings

hello, i use an ethernet connection. I also use a mixer to get music and a mic through to the meetings with good sound and minimal latency. I am noticing when I am watching the recordings, the mic sound gets quiet towards the end of the meeting?? I thought I fixed it by turning off 'automatically adjust microphone' but after the last update, a day or 2 ago, the problem is back? Did audio settings change? What should be selected? And deselected so my mic is the same throughout? 

Thanks!