Problem with internet settings I think

Messages
1
Location
Mumbai
ISP
Airtel
Hi guys
I have Airtel Internet and I am using the modem they provided. Previously I was using Belkin wireless modem till it broke down. So now I brought a new Router Asus AC66U and now the problem is my signal is good but the internet drops off. The modem is showing good connection. I have a computer plugged in via LAN and it never drops where as my cell phone shows good signal (Signal strenth: 3 out of 4 or sometimes 4 out of 4) n still cant browse. this happens once in 15 to 20 mins n specially wen i am next room.
I think there is something wrong with settings as my wifi strength is good. This did not happen with my belkin wireless modem.
I have cordless n microwave n all sorts of stuff so I switched from 2.4 Ghz to 5Ghz channel but no improvement.
Can u help me out with settings?
Thank You.
 

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