I'm experiencing a massive slowdown in bandwidth through Actrix in the past few days, and am wondering if anyone with a better knowledge of the net can shed light on possible causes?

I'm in Christchurch, connected to an ADSL2+ cabinet, and have been getting ballpark 800kbps throughput from international sites until a couple of days ago my non-local connection speeds became bizzare.

I'm using a USR9108 router with nothing/no-one else using the connection during the tests, and Actrix tech support have so far been unable to explain the situation.

Any advice would be much appreciated.