Viewers tuned in to Sunday Brunch today were left watching a blank screen in parts, as Channel 4's technical issues rage on.
The station has continued to experience disruption after going off air on Saturday night, the broadcaster confirmed today.
The programme apologised to viewers on social media, saying people are "working very hard behind the scenes" to fix the problems.
Host Tim Lovejoy told viewers "things keep happening that shouldn't be happening".
Channel 4 tweeted: "We continue to experience disruption to our services due to technical issues.
"We're working hard to resume our normal services and appreciate your continued understanding and patience."
One viewer responded: "Is that why everyone on Sunday Brunch sounds like they're in a tin?"
"Turned over to watch my fix of Sunday Brunch and there is no picture on the screen, same problem on your app," another complained to the station.
"Watching 4hd this morning Sunday brunch what's going on with your sound it's all echoey and distorted compared to Channel 4 which seems quiet," a third tweeted.
It comes after Channel 4 and More4 went off air on Saturday night.
Channel 5 also faced technical issues and went off air on Saturday.
Red Bee Media, which handles playout services for Channel 4 and Channel 5, said the disruption was due to an "activation of the fire suppression systems" on Saturday evening.
A spokesperson said: "We confirm that all staff at our Broadcast Centre in west London were safely evacuated following activation of the fire suppression systems.
"As a result of this incident and the automatic safety measures set in motion at the time, several services originating from the Broadcast Centre have been disrupted.
"London Fire Brigade attended the scene, and once they had determined that the building is safe, people were allowed to return to the building.
"We are continuing to work to restore all services and remedy any issues caused by this incident."
