Laptop with Broadcom 802.11n Network Adapter Sony Xperia S Samsung P5110 Galaxy Tab 2 10.1 Before I had other router (cisco) and these devices worked fine.

OK, I fixed it. Or, rather I isolated the problem. Everything works fine as long as I select b/g/bg mode. If I select n or b/g/n the problem persists. Is that a good reason to lodge a complaint?

yes

Yes, correct IP address is obtained. ipconfig command shows correctly ip address, gateway, dhpc server etc. MAC filter is disabled. I've tried to change security to WEP and even disable security...

Region : Poland Model : TL-WDR4300 Hardware Version : V1 Firmware Version : 3.14.1 Build 140916 Rel.67118n ISP : toya I've just bought my new WDR4300 and succesfully configured for wired connection...