TP-Link TD-W8968

Ordered it from Flipkart yesterday. Got it at around 3pm today even without paying extra for 1-day delivery (lucky me). Did a quick setup and it seems to be working fine.

Only sometimes the internet connection is suddenly lost. All the appropriate lights keep blinking on the router, the router stats show that the line is up, but I simply cannot ping to any website.

Anyone knows what could have gone wrong in the setup?
 
I thought routers of today were capable of walking up the PC. Here we are seeing the opposite effect.
 

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