HTC Touch p3452 WM 6.1 Wifi Issues

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Hi friends, i have HTC touch running on windows mobile 6.1. I have my modem configured for a static ip configuration, and both my laptops are connecting to it via the static configuration where
IP is : 192.168.1.x
Subnet: 255.255.255.0
Default Gateway: 192.168.1.1
DNS Address: 192.168.1.1

Before on i used to easily connect to the wireless network with the same settings, but recently it connects for one second and then it seems as if my modem bars the mobile's ip from data exchange and it reamins connected to internet only for a few seconds. I reformatted the phone completely, but even then the same thing is happening. Can any one help me?
I am sure the security key is correct too as it shows connected, but what can be the issue?

i asked same question Many times in Diffrent Forum But No reply. I got news that Windows Mobile are not good For Wifi