s3 wifi problem help

please help me. <br />
before my s3 worked well with it's full stock rom. and when i began to flash the cm12 rom .my s3 wifi connection had problem. when im near the router it can access but it will only totally connect if i will place it very near to the antenna. <br />
-and i tried flashing another rom from sammobile via odin. and the problem is still there. <br />
<br />
**HELP ME . WHAT SHOULD I DO?**


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