reply to grimsbychad 1.06mbps in Beamsville (on turbo 14). how did they connect their laptop to your internet? was it the same way as you have your pc's connected through wired or wireless? or maybe it is something about your operating system vs their operating system.
It could be a router causing the issue if this is the case.
Good point, same thing happened to me when my DI-624 died on me. The speeds slowed way down until I reset the router and then they dropped again. Mostly it was the disconnecting and dropping the wifi that made me toss it.