Virgin Media customers in various parts of the UK have reported a loss of service this week.
Customers in places including London, Birmingham and Nottingham turned to Down Detector to report broadband outages in their areas, the Inquirer reports.
Some complained that they had been left without a broadband service for more than 24 hours, while others said their TV and home telephone services were also not operational.
No official statement from Virgin Media on the cause of the downtime has yet been issued.
This comes after the company revealed that it attracted a further 30,000 broadband customers in the UK between April and June 2017, taking its broadband customer base to more than five million.
The upturn was driven partly by its ongoing Project Lightning, a £3 billion scheme to extend ultrafast fibre broadband to 17 million homes by 2019.