I have a 2004 PRT Alpha, and for a couple of years now, I've had issues with my router contacts working sporadically. Recently, I replaced both contactors and they worked for a few days then suddenly not at all. Then, after a period of time they will work for a little while and then quit again. The odd thing is, even when they are "not" working, I can hear and see them move and the router still will not come on. How can this be? I've talked to tech support a few times to no avail and I'm just kind of frustrated that I spent the money on new parts and it still won't work. My gut tells me it's probably something simple, but for a guy who is not real handy with a voltage meter, it is a big challenge to figure out. Do any of you guys have experience with this issue? On another note, I just finished upgrading my Z axis and it was very well worth the money!