robotics sound

[siuboho]

This morning I host a webina in zoom....we had stuidio setup and audio mixer that  using ATEM  mini as interface to send signal to zoom (both video & audio. ) I had montior the video & sound send to zoom and montior the reutrrn singal as a viewer. At first 20 minutes all fine & sound great. but after 20 mins...the sound we monitor as a viewer suddently sound like  a robotics ...till the end of the section (60 mins)
it turn a human sound to robotics.  And it's in the middle of the webina....I can't be anything on it.... Zoom how to advoid it no robotics sound in the futuer....if not sloution.... I might need to switch platform and stop pay zoom for eh webina.

best

siUbo