When it rains live news bloopers, it pours.

Jessica Adamson, a weekend presenter on 7 News Adelaide, was caught letting out an audible "f---!" as Sunday's live prime-time bulletin, alongside co-presenter Mark Soderstrom, was cutting to a commercial break.

It's unclear what sparked the frustrated outburst, but having to drily deliver the line "And the Big Ben cover-up: why its famous bongs are about to fall silent" might have something to do with it.

Channel Seven did not immediately reply to a request for comment.

Adamson's on-air gaffe comes as ABC viewers, including Labor leader Bill Shorten, rallied behind presenter Natasha Exelby, who was reportedly stood down by the network over her viral 'daydream' blooper.

Fellow TV presenters and journalists, including Tracey Spicer and Ben Fordham, have also come out in support of Exelby, sharing their own live onscreen nightmares with the hashtag, #PutOutYourBloopers.