Alesis mixer dropping audio

I am using a Yamaha CM500 - Headset with Boom Microphone, with the microphone output 1/8" into a 1/4" converter to put my microphone into the line input in my Alesis Multimix8 USB mixer. When I turn on the mixer and the phantom power, the microphone picks up for about 4 seconds before the audio and audio levels disappear. I am not sure why this is happening, especially because this is all new equipment. Is there a solution to the mixer dropping the audio after a couple seconds?
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