Thanks for your reply Adam. Yes I had the same problem on other devices as well. Received a support request reply from TP-Link and they asked to be reset the router to factory setting. I had to setup...

WEP does not work properly in 'n' mode.You may have to use the a/b/g modes.

Region : India Model : TL-MR3020 Hardware Version : V1 Firmware Version : 3.14.2 Build 120817 Rel.55520n ISP : HNS/Instanet (Cable Internet) I am using the Router in 3G/4G mode, with WAN only (PPPOE)...