That's a new one, I haven't heard of that happening in the two years this game has been up. I'll post it on my Twitter and see if anyone else has the issue. Is it caused by the most recent version 3.0.7?
You have sound effects on, correct? Voice blips and sound effects are different things. Exclamations like "Take That" and "Objection" are under the "sound effects" category, not "voice blips" category if you have one of those turned off.