Galaxy s3 flickers and signal off

I wish that some one can help me with this isue:

I have an galaxy s3 bought around 15 months ago.Before 2 months the screen flickers and when I restarting the phone all goes away!

This days the issue change more dramatically,the screen flickers,the phone be unresponding,and the signal goes off!

I have asked to many techniacal here in my country but thay made an restore and all,but this issue continue!

I have seen the battery and I see that it was not uniform,does this cause it??

Please I need any idea what cause this!!

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