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You can try to do the followings:- Perform a full flash format without the bootloader with SP Flash Tool - You will lose your IMEI numbers
- Flash the latest ROM with SPFT
- Recover your original IMEI with SN Writer Tool
If your issue still persits, then your phone should be cheked by a skilled repairman since you might have a hardware defection. Before that, I recommend to test your phone at different places and with SIM cards of different carriers to rule out the possibility of a specific place, carrier or SIM card related issue.
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