My TP-Link Router (model TP- WR941ND) is having some issues. When I connect the modem directly to my pc via a internet cable it works perfectly, but if I connect the modem to the router via the internet cable my pc detects the wifi connection, but with no internet. I've tried connecting my pc via wi-fi or by connecting it directly to the router. I'm believing that the router is not working properly, because before it was presenting this issue my internet connection was not that fast as it used to, and also my ping was a bit high. Is there anyway to fix it or do I have to buy another one? Please help!