I have comcast broadband connected to Dlink wireless router. I have old g4 powerbook (15") using panther, and it connects fine to the wireless router. My new MacBookPro (15") runs Leapord, and it connects fine, but every several minutes I get 1 minute or more 'hangs', like the signal isn't strong enough. I finally upgraded the g4 powerbook to Leapord, and I notice it there now, also. This happens even when the laptops are placed only several feet from the router. I contacted apple support and was told the firmware on my dlink router is likely the fault. I'm up-to-date on firmware, however. I'll try to go to some coffee shop with wireless to see if it happens with other wireless routers, but I wanted to inquire if anyone in this forum can advise what to do, or confirm if it really is a firmware issue (which doesn't make sense, since why wouldn't Leapord be downgrade compatible; i.e. the firmware was fine for panther, so why wouldn't Leapord be smart enough to use same firmware?). To test wireless router, I turned off secure setting, filters, etc. None of it made any difference. There might be some option I didn't test yet, however. I just used the settings that I know worked fine with g4 using panther. ethernet seems fine, however, on either laptop, but I sometimes get smaller (about 5 to 10 second) stalls, which happens when connecting straight to comcast modem, so has nothing to do with router. These stalls I think are from comcast, but I have yet to find the right internet speed tester to prove it.