I am using the home 649 plan on airtel. I am supposed to get 512 kbps till 5 gb(fair usage policy). But I am getting 512 kbps only for the first 10 minutes after I turn on the modem. After 10 minutes the speed goes down to 256 kbps and I have to switch on/off the modem again to get that speed back. Anyway I have not crossed the 5 gb FUP limit. Is it airtel itself or something on my side?