Viewers across the UK faced pixelated screens or the inability to access its TV channels, while some reported audio and complete blackouts.
The broadcaster said the interruptions started around 3 pm and lasted for 45 minutes.
The broadcaster confirmed that the problem is now fixed but did not reveal the cause.
According to DownDetector, a total of 88 percent of problems were reported on live channels, with 11 percent experienced through the website and one percent realized through the app.
An ITV spokesperson said in the evening: “We apologize for the lack of picture quality experienced by viewers watching ITV on Freeview this afternoon. Service has been restored for these viewers.”
Those reporting difficulties included visitors from London, Kent, Middlesex, Essex, Hampshire, Bristol, Greater Manchester and Yorkshire.
One person tweeted: “ITV it’s good that you are informing your viewers so well of your lack of channel reception. Nope.”
Another person said: “ITV what’s up with all ITV channels? There’s sound, no pictures. HD channel 3 ok #itvdown.”
Freeview also recognized the issues, responding to an audience on Twitter.
Its official account said: “We are currently aware of the issues with ITV channels. We don’t have any further information yet. We recommend not to do re-tuning. “
Thousands of viewers faced technical problems between 12 and 5 pm on Sunday, when viewers reported that their screens were freezing or pixelated with poor sound quality.
It is not the first major broadcaster to experience technical problems in recent weeks.
Thousands of viewers reported difficulties with the main channel, Channel 5 and subsidiaries, including e4, 4more and 4music.
Channel 4 apologized for the issues.