The risk of getting flagged added to the pressure of presenting at meetings, Murphy said. “All the sudden you’ll hear a pen click, and you’re thinking, ‘What did I say that wasn’t right?’”
It's a quote from a source so at most I would expect a "[sic]". Thinking about it more... it seems like an intentional mistake by the speaker to demonstrate the sort of verbal flub the quote is about. In which case it's pretty clever and a "[sic]" would kind of ruin the subtlety of the joke.
"All the sudden"?