I've had some problems connecting to the internet lately through my WLAN lately, looking for suggestions on what might be causing it/how to fix it.

Here's my setup:

In a front room, I have a cable modem attached to a SMC wireless router, SMCWBR14-G. In the back room, I have 2 desktops connected to an identical router, and I have WDS set up on both routers. One of the comps also has a wireless card. I also have a Dell laptop. At any given time, I can access the internet with any one comp, both desktops, or the desktop with a wireless card and the laptop. Any time that I access the front router with the laptop (and possibly the back, but I usually use the laptop in the front), the routers stop communicating with each other and I can't get on the internet. Doing a reset on the back router fixes the connection, but I can't find a way to fix the problem entirely. Also, the issue didn't come up until a month or more after I set this up.

Do a drawing. I am so confused. Sorry.

Looking at the drawing, I'm going to assume the dotted lines is wireless connections and the filled in lines are wired connections.

With that said, what DID you setup a month ago? What was working before then?

Any way you can move the cable modem to router 1 instead? and have that 2nd router purely to for wireless for the laptop?

//krunk (^_^x)

Yes, dotted is wireless, solid is wired. The setup was working exactly like this, I didn't make any changes between when it worked and when it didn't, at least that I can recall. The modem has to be attached to Router 2 because my apartment only has one cable outlet, and I don't want to run a cable through the middle of the apartment. The outlet is at the South-East corner, computers are at the North-West corner.

There's a thread over at BroadbandReports.com discussing your router and the disconnect issue. Link
Although your issue sounds a bit different it may be related to the issues others are having.

NOTE: I'd contact SMC support before trying any firmware updates.

I just want to mention that in an environment like yours I've been using powerline ethernet adapters and they've been working very well. It's something you may want to consider if the wireless issue cannot be resolved and file sharing between the front and back computers isn't a requirement. You'll need a pair and they can be pricey ($75 - $100 for the pair) and the speed is under 10Mbps. They work well for connecting to the Internet though. I don't recommend getting the refurb ones. About 1/3 of the refurb units I've purchased didn't work properly and had to go back. I've been using the Netgear model XE102.