+ 0 Votes Degradation of DSL mjd420nova September 12, 2013 at 9:04am PST Lately there's been a rash of DSL lines going S L O W . A reset of the modem corrected that. there may be a line problem, a connection problem, even a splitter failure and a phone malfunction could all affect line quality. The router may have another problem. Try cloning the MAC address of the PC to the router. + 0 Votes Has your DSL provider done a circuit test? robo_dev September 9, 2013 at 7:42am PST The DSL provider can do this with a circuit tester, and you can do the same thing by getting into the diags menus of your DSL modem and see things like near-end CRC errors, negotiated connection speed, signal-to-noise ratio, etc.If your connection gets worse when it rains, that's a clue that there is an underground wiring problem. If you live in an old apt building, then switching to cable modem may work better.