Need help with dropping network on Cativate

Hello,

I have a captivate running MIUI. Today at around 4PM, it stopped detecting a network. I am using Docomo. Flashed different ROM's, no change. Tried an Aircel sim, no network. Docomo sim was working on a different phone. Came back home and put in an aircel sim, switched on airplane mode and then off and i got signal and could make calls. It worked for some 10 mins. I lost signal again and now its back. This seems very odd and i have never faced anything like this before. Anybody has any idea why this is happening? My docomo sim is working perfectly fine in another phone so i dont think it is network problem. Is the phone faulty??
 
How did you get your phone unlocked? Using SuperOneClick by entering unlock code OR by using scripts from GalaxyS Unlock by Helroz (from Market)?
 
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