Loosing Mobile data frequently...:(

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http://forum.xda-developers.com – Hi, I have Galaxy s i9000. I bought through e-bay. It was locked to Bell Mobility, Canada. Then I brought it to India and unlocked it and using it for Airtel service provider. Problem: Regardless which ever ROM I use, all are working fine except Mobile Data. I frequently loose the mobile data, then I have reboot the device to get my mobile data back. This is happening with all the ROMs and also very frequently aswell. I tried other kernals aswell, but no use. Modem: UGKG3 (Other than this Modem, nothing works on my mobile) Provider: Airtel (India) Please suggest me if you have any solutio (HowTos)