Thousands of Telecom Italia customers across Italy have complained of internet outages and glitches which the company blamed on problems with an international link.
Users from the northern city of Milan to the Sicilian capital Palermo reported problems on Sunday, with the issue mainly focused on fixed-line internet services.
Some football fans bemoaned interruptions to their streaming of the Serie A game between Spezia and league leaders Napoli.
"An international interconnection problem impacting the service at national level was detected. Analyses are underway to resolve the problem," a TIM spokesperson said.
There was no indication that the problems were caused by hackers, Italy's ANSA news agency reported.
TIM, Italy's former telecoms monopoly, is at the centre of a takeover struggle, with private equity group KKR having made a non-binding bid to buy its network.