Yes it happens only when I use the Bluetooth and Wi-Fi on the same device. There seems to be interference between the 2.4G and the Bluetooth. It started happening from first time I started using this...

Hi! I got TP-Link TD-W8961N. My ADSL connection is stable 20 Mbps. But every time I use Bluetooth headhones or transfer files with Bluetooth download speed drops immidietly from 2500 kB/s to ~200...