Almost a year back, I had changed my plan earlier to 1350 plan which had FUP. So they migrated me from NIB-1 to NIB-2 and my IP changed to 117.x.x.x. I am living with this problem since more than a year. Now I am back in 750plan, but still facing same problem. BSNL guy is saying problem with Modem. But my analysis has a strong feeling that this started when my network changed.