BSNL Broadband : WPA2 PSK2 disconnects in Utstartcom WA3002G4

[dalfish]

HI i am having a problem with wireless security. WA3002G4 works fine when connected by unsecure mode. As security is the first priority for WIFI networks I have given a passphrase for WPA PSK2 saved settings and rebooted the modem . But after some time i switch it back on the Modem fails to connect to the laptop. i have browsed the forums but not able to find a permanent solution to this problem. I have tried WEP also but failed again. I cannot connect the modem in unsecured mode. It is like putting ourselves at risk. Please help