if you worked find 2 days ago, then i think you need to give them a call, they make have changed some line noise patterns, it may just require them to switch it back for your speeds to be around 3mbps again.
corrupted12 welcome to the forum.
first of read through here http://www.testmy.net/forum/t-2097
also have you done spyware/adaware scans, along with virus scans.
Have you tried tweaking with cablenut at all?
if you two really want to see old people, come to east Boca Raton, FL were everyone eather has a cane or a walker, with there oxygen machine rolling right behind them.