WRT54GL v1.1, Thibor15c. Usually on channel 13 - no problems. Tried to switch to channel 1, and could not connect. Netstumbler showed that the AP could only be seen for a second every few seconds. Tried, and found the same, with channel 2 thru 4. When Netstumbler sees the AP, it shows the right channel, i.e. the channel that I set. Channel 5 thru 14 no problems again. I also have a WRT54GS (dd-wrt) and this one does not show the intermittent behaviour on the low (or any) channels, so I think interference from an outside source is out (although I did not put the routers right next to one another when testing). Tried soft and hard reboots - still the same. I have not reset to defaults or reflashed, but I figure the channel number is only a parameter, so reflashing would not really change that. Any ideas?