Virgin Media has twice apologized after the broadband outage affected tens of thousands of customers.
Customers initially experienced outages starting at 2am on Tuesday, and the company said the issue was resolved by 11.30am.
At 4pm, the outage was reported again by Downdetector, an online platform that provides users with real-time information on the status of their broadband service.
In a statement at 5.25pm, Virgin Media said: “Unfortunately, we are seeing a resurgence of an earlier issue which caused some Virgin Media customers to experience intermittent broadband connectivity issues.
“We again apologize to those affected, and our team is continuing to work hard to find the root cause of the issue and fix it.”
Of the 55,000 people who reported internet outages at 5 p.m. Tuesday, one in five reported they experienced a total blackout.
Some irate customers are now demanding refunds because the price of their service would have gone up after the interruption.
One Twitter customer, Sean Brody, wrote: “What have you been doing for the past two days to refund customers?
“I’m fed up with paying for services I don’t get often. Time to shop around I guess. Especially if you’re raising your rates by 50% next month! #robbery.”
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Aidan Minter added: “Even your service department is against your ridiculous price increases.”
Earlier on Tuesday, Virgin Media said its team was working to identify and resolve the issue as quickly as possible.
Sky News has contacted Virgin Media for comment.