Plz help!No service problem

I tried to flash to a new rom and i did it successfully. All works fine but i have a problem, when device locks my device appears no service.There is no signal
When i flashed the rom, sim was inside.
Do you think this was the problem?
Other users with same device same rom did not have any problem.If i try to flash again causes to lose my data?
Thank you in advance. I am looking forward to your replies.

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