Despite misgivings from a number of users, Xtra insists it does not throttle bandwidth for surfers intent on using file-sharing websites.
Some users of sites like KaZaA and Bear Share have reported congestion when trying to use the service.
"I'm down to 0.6kbit/s all the time," says one user who believes Xtra has been cutting back on access to such sites.
However Xtra spokesperson Matt Bostwick says that isn't the case and the ISP doesn't throttle bandwidth. "No, it's not something we do at all."
Bostwick points out that some of the sites, like KaZaA, have been in the mainstream media of late.
"If you look at the [KaZaA] site you can see a counter that shows how many people are accessing the service. That number has increased dramatically in the last few weeks."
Bostwick says just prior to Napster being taken offline the user number increased dramatically as well as users clamoured to download files before the service was terminated.
"Perhaps that's what's happening here."