Electronic Burps

I have used Audacity for a few years to record our churches sermons, convert them to mp3 and post online. The the past year or so the recordings have these electronic burps every once in awhile. The Windows program is Vista Ultimate and we record with a wireless and sometimes a regular mic. What may be the cause of the burps and how do I stop them?

Please post a short sample WAV file of the problem. See https://forum.audacityteam.org/t/how-to-post-an-audio-sample/29851/1 for how to do that.

This page may also be of assistance if the problem is small dropouts in the recording:
Managing Computer Resources and Drivers - Audacity Wiki .