s3 i9300 wifi not working PLZ HELP ! - Galaxy S III Q&A, Help & Troubleshooting

when i got this phone the wifi was working properly , then i installed a rom called s5 sensation v11 and my wifi is only working when i am standing by the router . After that i flashed the stock rom through the kies 3 and the wifi problem is still here PLZ HELP ME !

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