Latlety me and my roommates have had a problems with internet connection. Firtstly the connection start to beeing slower. Next while I thought that somebody has broken into our network, so I’ve connected via LAN and turn off WiFii connection. After this, when I was connected only via LAN, everything works fine. But if I try to connect any other device via LAN or WiFi, the conection started to fail and I can’t load any site on any device. Everything started about 1 month ago. Ealier I didn’t have any problems with creation and work on this network. After many attempts I’ve found on internet article that give me an idea that the problem wasn’t bad configuration but router or modem. So in about couple of days I’ve bought new router, install and configure it on my network, and gues what… It works 
Here are pieces of my local network:
1) ISP – UPC Poland
2) MODEM – Scientific Atlanta Webstart EPC 2203
3) ROUTER: Linksys Wireless-G Broadband Router WRT54GL on default software (ealier: Pentagram Cerberus WiFi 802.11g Lite)
4) DEVICES: 4 laptops that have built in wifi cards that runs on OSX, Windows XP, Windows 7, Windows Vista. 3 mobile devices with internal WiFi cards: Samsung Galaxy GT-i7500, Nokia, Samsung Monte
HINT: When I was runnning on ealier router (Pentagram) I had problems with internet connection on Samsung Galaxy i7500. After router change everything works fine. But I’m not sure that the source of those problems was router.
