Be Broadband is urging its subscribers to ensure they move across to the firm's new core network.
Since May 2012, Be Broadband has been moving home internet customers across, exchange by exchange, resulting in a change to their IP addressing.
Each customer has been informed of the need to update their service to ensure broadband continuity, but Be said some subscribers have not been following the instructions.
"Our biggest problem has been ensuring that you’ve seen the emails and texts we send you during the 30 day 'dual running' period," the firm stated.
"We’ve been calling some of you to let you know what’s happening and to help you make the move across to the new network. But we really need all of you with static IP addresses to move across to the new network before your 30-day window expires."
This will help keep service disruption to an absolute minimum, Be Broadband stated.
The company has been sending emails to customers after ten, 18 and 25 days of this period, in a bid to "catch their attention".
Be explained that customers with multi static IP addresses do not need to do anything, as they will automatically be migrated across to the new network.
"Let us know what you thought of the information we sent you and whether there’s something more we can do in future as we continue across the network," it added.