Signal problem, I cannot call even if I have signal

Hello,

I have problem with my Meizu MX3. After two weeks i replaced my broken display to new one I have all the time problem with GSM connection, not stable and even if

I have 4/5 commons of signal I cannot call anybody... its totaly deaf. Before replacement wasn´t so bad, not 100% but when I had signal I can call.

Only way I can call is...reset the phone and for a while its working... Can somebody give me advice what should i do or try?

My meizu is on 4.1.3.5I

4.2.8.2I i tried too, but the same problem so Iam back on 4.1.3.5

Thanks

Kamil from Czech Republic