I used to get connection speeds of 38 to 42 but suddenly, for no apparent reason, I am getting speeds of 18 to 22. The only thing I can think of is that one of the automatic Windows updates changed something. Any ideas?
Have you bought a new phone and plugged it in to the same line somewhere? The amount/type of other devices connected to your phone line can slow it down - try removing everything else and seeing if it changed your speed.