During the Channel 4 show, hosts Simon Rimmer and Tim Lovejoy were joined by guest Tracy-Ann Oberman.
The former Eastenders star, who played Chrissie Watts, was telling the presenters a story during a cooking segment when she was suddenly cut off.
Tracy was oblivious to the glitch until Tim interrupted and call for a new microphone.
He said to her: “Hold on there, apparently your mic’s gone down. Can we get one in!?”
The actress was amused by the blunder and claimed she always has a dramatic experience on the show.
She said: “Every time I’m on this show something dramatic happens.”
Tim then held a microphone up to Tracy to allow her to speak while Strictly Come Dancing contestant Simon laughed in the background.
“It’s like old school,” said the Doctor Who star.
After finishing her story, she went off to get her microphone fixed.
Making her way back on set, she asked: “Hi, can you hear me!?”
“I enjoyed watching that happen,” said Tim.
Tracy added: “I got frisked by the mic man. They are so good this team.”
Those watching took to Twitter to comment on the blunder with one writing: “When Tracy Ann’s mic fell down her bra *sigh*#SundayBrunch.”
Another wrote: “@TimLovejoy holding a microphone up to @TracyAnnO as her mic has fallen down, meaning Tim has a reason to be on the show for the FIRST. TIME. EVER! #SundayBrunch.”
A third added: “There was nothing wrong with her mic we could still hear her… #SundayBrunch.”
Sunday Brunch continues next Sunday on Channel 4 at 9.30am.
