Hi guys i have an mtnl internet connection with its rented modem. I bought a wifi router TP Link WR740N last month to connect my android phone with it. The problem i am having is that sometimes i can open all websites on my phone with wifi but sometimes though i can open most of the sites i cant open some sites like youtube and google play store and sometimes though sites like youtube and play store open i cant open videos and download apps from there. I called the customer care of TP Link and they told me to set the mtu size to 576 but that didnt help either. So any solutions for this?