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''- The screen is gray with noise (lines and dots) and then restart.''You can guess that, your phone is defective, it can't be a software issue.
''- Bluetooth turns off by itself.''
Absolutely not present generally.
- high power consumption, battery drains quickly.
What does ''high'' means at you? Dod you mneasure your screen on time?
- the signal is down when a call is initiated.
While in call your phone may switch to 2G or 3G connection from 4G if you don't use a VoLTE service. So the signal stength can change as well. Nowadays on most networks 4G services are stronger.
Especially because of the screen issue, your phone seems to be defective. You should contact your seller for a replacement, don't wait for an update. Software updates can't repair hardware defections.
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