BT customers in Northern Ireland have been left without broadband services on Wednesday - the second time in a week.
"BT is currently experiencing localised disruption to some broadband services as a result of a similar technical issue that occurred over the weekend.
"The issue has been fixed and broadband services are being restored to affected customers," a spokesperson said.
On Friday, a technical fault left tens of thousands of homes without internet broadband.
The company said the problems affected a "significant part of the UK", including Northern Ireland, Scotland and northern England, on Friday night.
Wednesday's statement advised customers who have been having problems to reboot their equipment.