Wow, what plan gets you those speeds?!
Yeah, my upstream was always 100% consistent at 1.85 Mbps until Tuesday afternoon. On the weekend, I had an outage (MTS had turned off my entire service accidentally) then they moved me to a different box outside Monday to get my service going. My speeds were perfect Monday, but then Tuesday is when the upstream went down, in the late afternoon, and it's been the same.
It's not a HUGE drop, but from 1.85 Mbps to inconsistent 1.0 - 1.36 Mbps with every test.
On my iTouch I was able to get 215 KBs (which is close to 1.8 Mbps) once, but that was it. Downstream is better than ever though, and my margins seem very good (no errors showing on the box, margins are better than I ever had), so it seems like maybe something from the box on the street going out?