Limited Connectivity after new printer

Question

Hi,
In short, after adding a new laptop and wireless printer to the network,  network access to all connected computers goes down whenever a computer boots up or awakens from sleep. After a few minutes, access is restored in full but this is very annoying. This all happened after adding the Dell wireless printer using the auto connect button on the WRT110 as per the printers instructions. Doing this connected the printer but killed access to all other computers.
The network consists of 3 wireless routers connected a couple years ago from a guide on this site. It has always worked flawlessly until I hit that button. I ended up doing a hard reset on the cable modem & the main router, pulling all the ethernet cables, and resetting the security pin. This allowed me to get online and I thought it was fixed till the windows 7 laptop went to sleep and woke up to the limited connectivity message, almost like a conflicting IP problem but have had no messages to confirm that. I also noted that by looking at the DHCP status from the WRT110's settings that it doesn't always show all connected computers even when they are accessing the internet.
The routers were hooked up so they could be seen as a single network and you could roam accross the property without switching networks. If I remember correctly, the 2 slave routers were hooked into the main router through the lan ports instead on wan ports. I can't say I completely remember or understand how it exactly worked, but it did. The only things that changed was adding a new windows 7 laptop and that Dell printer to the network. I didn't want to have to re-learn everything I went through to get it up and working before when it seems like the problem had to do with the new items added to the network. It seems to me like the DNS isn't working properly for some reason.
Some network details:
All connected via DHCP unless noted otherwise
WRT110
Cable modem via wan.
Wii console via lan
Vista Laptop via wlan
Windows 7 laptop via wlan
Dell printer via wlan
WRT54G
Windows XP / ubuntu desktop via lan (Static IP)
xubuntu / Windows XP laptop via wlan (Static IP)
LG TV via lan
WRT110 via lan
WRVS4400N 
Windows XP desktop via lan
WRT110 via lan
The WRVS4400N hasn't been turned on over the winter as its' connected desktop is not really used any more, but its' wireless is used often in the summer as it's the closest AP to the garage.
Any help on this would be most appreciated as I don't have much hair left to pull out. I'm not opposed to setting up the network from scratch again, but want to know I'd have some guidance before trying to do so again.
Many Thanks,
E

Answer 1

Well I didn't get a change to update firmware today unfortunately. Will probably be Monday now as we have company all weekend.
In my hunt for the original guide I used, (from this site) I was unable to find it again. I found others that were not nearly as informative as the one I followed, but didn't explain about the pros and cons of setting it up lan to lan vs. lan to wan. The guide I followed also went into setting up differnt wireless channels and was way more informative than anything I've been able to locate this time around. I would be very appreciative if anyone knew where I could locate this guide again. I'm certain I had it bookmarked, but may have lost it with my HDD failure this past year and wasn't backed up.
Lastly, I realize I "could" use my other router as the main wan router, I just wondered if there was any advantage in doing so. I was also trying to find out which of the 3 routers had the best real world range, as I would use it to get a better connection in my garage.
Thanks again, and regardless I will still report back after the firmware update, and whether it fixed the problem.