Time Capsule internet (DNS, timeout?) problem

Hi,

I've recently bought a Time Capsule to replace my horrible D-Link router.

Everything was working fine the first two or three days. I also upgraded it to 7.3.2 firmware. But that day I had a Safari crash, relaunched it, and thought I'd killed Safari somehow. Some webpages wouldn't load anymore, some youtube videos wouldn't play or the video player would stay blank.

However, I quickly realised the problem wasn't just Safari. Firefox and my other mac and my PC are also giving the same problem.

For example, I'm incapable of browsing to:
http://www.apple.com/startpage/
http://www.i-am-bored.com/
http://www.imdb.com
http://www.facebook.com
while some other sites work perfectly.

When I click refresh 15 times, it might load the page, although not always completely. Sometimes it gives a time-out error.

I reset my router and I restarted the TC from the Airport Utility without any effect. I thought it might have been my ISP but it continued the entire weekend. So this morning I plugged my iMac directly into the modem and the problem disappeared. My ISP only gives an IP release every few hours, so I cannot switch between the TC and the computer continuously. But in my opinion something's wrong with the Time Capsule.

It's only browsing that's giving problems. FTP goes as fast as ever, Remote Desktop is no problem, downloading is no issue. It's just some webpages that refuse to load. So I'm guessing that TC is for some reason giving time-outs or is having problems with DNS.

I wanted to restore the TC's firmware, but I can't seem to find any older firmware version. I found the 7.3.1 firmware included with the Airport Utility on Apple's site (after clicking the google link 500 times for the page to load ), but I can't install it since I already have a newer version.

Can anyone help me on how to solve this problem? I think when my Safari crashed it was due to the TC, or Safari did something to the TC (which would be really weird). I will reconnect the TC to the modem, wait for a new DHCP release and see if the problem persists. If so, how I can put back older firmware (I searched google, but I couldn't find any help on this). I can only select 7.3.2 from the Airport Utility, or manually select a file (but I don't have one). I'll also try to reset the TC completely by pushing the button for 5 seconds to see if that fixes it.

Thanks in advance for any help.

Best regards,
Edward.