I have bought Micromax funbook infinity P275 from kuduvancherry - chennai. I tried connecting internet through Airtel 3g dongle with vodafone sim. For the first time it has connected automatically and was working fine. But from the 2nd time onwards, it couldn't connect and screen flickers and tablet goes blank while searching for the networks [ error finding network is shown ]. everytime i need to hardly switch off and on again. till now i cudnt connect to internet. the same dongle i used to access net in my laptop. Pls help me to resolve this.