s3 mini i8190 signal problem help please !! - Galaxy S III Mini Q&A, Help & Troubleshooting

hello, please help
s3 mini i8190 signal problem
Although the sometime signal strenght indicator shows 3-4 bars, do not send messages, I cannot be called, cannot call and data is not being fetched.
the current system cm12.1_golden.nova.20150901
The same problem exists on different ROM
similar problem :
http://forum.xda-developers.com/showthread.php?t=2057285

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