"Sorry you must not have been pulled up to the speaker enough". Under-rated strategy.

Come back and say " hey there, thanks for your patience. What can I get started for ya?" . Makes them feel bad every time because they feel like children with no patience.

I always say “sorry my headset turned off”

One of my partners was taking someone's order, and she asked for a minute. My partner didn't hear it and said, " I'm sorry?" This frickin lady said "I need a second ok? I don't even know you!" My partner legit took of his headset and was like someone else can take her order. She continued to be rude to all of us, and my partner looked like he wanted to quit.