Motorola SURFboard SB5101U with Linksys wireless router I purchased this modem to replace the rented one from my ISP, and hooked up to my current Linksys WRT54GL router. I have a great internet connection close to the router, but when using downstairs (1500 sq ft condo) the internet connection comes and goes at random. Does anyone have an idea if this is a modem or a router issue? I never had this problem with my rented modem, possibly I need a better modem? Thanks!