Microphone fails to stop

Dear,

My experiment contains 32 trials and each trial contains mic component. However, at the middle of the experiment, lets say in 16 trial, the experiment starts to hang and delay images and texts. When I remove the the mic component, the experiment works smoothly. It looks like the mic component fails to delete something from memory and it gradually fills up.

Could anyone help me with this?

Best,
Sami