IOS 8.0.2 on iPhone 6 i get NO SERVICE after every hang-up

Hi,
iPhone 6, iOS 8.0.2, DFU restore without any restore from iCloud.
After i hang-up calls, phone switches to NO SERVICE for few seconds then gets on 4G again.
If i toggle 4G switch to OFF in Settings> Cellular this issue is not present anymore.
Tried in many locations, with different SIM cars from different operators.
Also i noticed that with phone in idle, it continously switches from 3G to 4G and back and battery is draining fast.
With 4G switch ON battery goes from 100% to 10% in 5-6 hours, with 4G switch OFF, in same amount of time, battery discharges only 20%.
Here is a video of this issue: https://www.youtube.com/watch?v=Cgao1RlPbtc
Anybody can help!

Howdy pughr798,
It sounds like you have updated to iOS 8.0.2 but cannot connect to your cellular service. I would use the troubleshooting from the followng article, named:
If you see No Service in the status bar of your iPhone or iPad
Follow these steps, testing after each.
Tap Settings > Enable Airplane Mode, wait five seconds, then turn off airplane mode.
Restart your device.
Remove the SIM card. If the SIM card is damaged, worn, or bent, or if it's too big or small for the SIM tray, contact your carrier for a new one. Then reinsert the SIM card.
Check for a carrier-settings update: Connect to a Wi-Fi network, tap Settings > General > About, and install any available carrier-settings updates. If you can't connect to Wi-Fi, connect your device to a computer that has iTunes.
Update your iPhone to the latest version of iOS.
Reset network settings by tapping Settings > General > Reset > Reset Network Settings. This will reset all network settings, including Bluetooth pairing records, Wi-Fi passwords, VPN, and APN settings.
Contact your carrier to check for any network or account issues.
Restore your iPhone.
Thank you for using Apple Support Communities.
All the very best,
Sterling

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