Appears to be a duplicate of this question.
However that question was specific to prompts being played to the channel while the recording was placed on the bridge. I assume if more than one channel is added to the bridge then that issue wouldn’t occur. As long as the channels had a constant stream of audio.
Seems like it can also occur when mute is pressed on whatever application. Some applications can probably stop the rtp/audio stream and then later do a re-invite once unmuted. I guess some forms of network blips can also cause the issue, maybe even an abnormal amount of rtp packets being dropped.