Xperia Miro GSM problem - Sony Xperia Miro, Tipo (Dual), J, E

hi guys,
i bought the Xperia Miro over a month ago and everything was great since 3day ago.
3 days ago the phone GSM signal started acting weird. it connects and disconnects rapidly. somehow its not as strong as it should.
i took it for repair but they couldnt fix it. the said nor hardware nor software of the phone is broken and everythings working fine.
i still have the the problem and dont know how to fix it.
installed a couple of signal boosters like Fresh Network and Open Signal, they made some changes but nothing permanently.
plz help me.
it sucks to lose a phone u bought a month ago!

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