[Galaxy Note 4 Android Development (Snapdragon)] linqdesires:
Even updating modem and bootloader with yours ripee or even taking them out from full official firmwares (N910F https://updato.com/firmware-archive-select-model?q=n910f&rpp=15&order=date&dir=desc&exact=1 ) I'm not getting out of the issue.

After phone boot radio is there, then after 4-5 hours I get "no service" and radio not available.

On my modem logs which I already shared I have plenty of SIM_IO Error, this is the beginning of the error:

03-18 15:50:36.337 D/SubscriptionInfoUpdater( 2152): [Receiver]+
03-18 15:50:36.337 D/SubscriptionInfoUpdater( 2152): Action: android.intent.action.SIM_STATE_CHANGED
03-18 15:50:36.337 D/SubscriptionInfoUpdater( 2152): slotIndex: 0
03-18 15:50:36.337 D/SubscriptionInfoUpdater( 2152): simStatus: NOT_READY
03-18 15:50:36.337 D/SubscriptionInfoUpdater( 2152): [Receiver]-
03-18 15:50:36.341 E/use-Rlog/RLOG-RIL-QMI( 452): qmuxd: TX message on fd=14, to qmux_client_id=0xb, len=147
03-18 15:50:36.341 E/RILD (12068): ReceiveMessage: svc(NAS), msg(0x34:QMI_NAS_GET_SYSTEM_SELECTION_PREFERENCE), indi(0), size(248), err(0)
03-18 15:50:36.341 E/RILD (12068): RxGetSystemSelectionPref: param(7), result(0), mode_pref_valid(1), net_sel_pref_valid(1)
03-18 15:50:36.341 E/RILD (12068): Result(0), Error(0)
03-18 15:50:36.341 E/RILD (12068): RxGetSystemSelectionPref: voice_domain: 0
03-18 15:50:36.342 E/RILD (12068): SIM-MGR(5): evt(219)
03-18 15:50:36.342 E/RILD (12068): Failed to open channel
03-18 15:50:36.342 E/RILC (12068): iccOpenLogicalChannelResponse Invalid response: NULL
03-18 15:50:36.344 E/RILD (12068): GMISC-MGR(18): evt(176)
03-18 15:50:36.344 E/RILD (12068): MISC-MGR: OnOemChangeDeviceCapa() new voiceDomain:0 oldEutran:255 oldUtran:255
03-18 15:50:36.344 E/RILD (12068): SIM-MGR(5): evt(201)
03-18 15:50:36.344 E/RILD (12068): RefreshRegion: mCscSalesCode(), mCscCountry(), mCscCountry()
03-18 15:50:36.344 E/RILD (12068): RefreshRegion: mOmcSalesCode(), mOmcCountry(), mOmcCountryISO()
03-18 15:50:36.344 D/IccCardProxy( 2152): broadcastIccStateChangedIntent intent ACTION_SIM_STATE_CHANGED value=IMSI reason=null for mPhoneId=0
03-18 15:50:36.345 E/RILD (12068): GMISC-MGR(18): evt(160)
03-18 15:50:36.345 E/RILD (12068): MISC-MGR: DoOemSetDeviceCapa() Recieve Eutran:0 Utran:0
03-18 15:50:36.345 E/RILD (12068): MISC-MGR: DoOemSetDeviceCapa() SetDeviceCapa: 0
03-18 15:50:36.345 E/RILD (12068): TxSetVoiceDomain: Send system selection preference
03-18 15:50:36.345 E/RILD (12068): TxSetVoiceDomain: Do not send voice domain pref, it is same
03-18 15:50:36.345 E/RILD (12068): SIM-MGR(5): evt(201)
03-18 15:50:36.345 E/RILD (12068): RefreshRegion: mCscSalesCode(), mCscCountry(), mCscCountry()
03-18 15:50:36.345 E/RILD (12068): RefreshRegion: mOmcSalesCode(), mOmcCountry(), mOmcCountryISO()
03-18 15:50:36.345 E/RILD (12068): SIM-MGR(5): evt(201)
03-18 15:50:36.345 E/RILD (12068): RefreshRegion: mCscSalesCode(), mCscCountry(), mCscCountry()
03-18 15:50:36.345 E/RILD (12068): RefreshRegion: mOmcSalesCode(), mOmcCountry(), mOmcCountryISO()
03-18 15:50:36.345 E/RILC (12068): Invalid response: NULL
03-18 15:50:36.345 E/RILD (12068): RefreshRegion: mCscSalesCode(), mCscCountry(), mCscCountry()
03-18 15:50:36.345 E/RILD (12068): RefreshRegion: mOmcSalesCode(), mOmcCountry(), mOmcCountryISO()
03-18 15:50:36.346 E/RILD (12068): RefreshRegion: mCscSalesCode(), mCscCountry(), mCscCountry()
03-18 15:50:36.346 D/RILJ ( 2152): [6389]< RIL_REQUEST_SIM_OPEN_CHANNEL error 17 [SUB0]
03-18 15:50:36.346 D/RilRequest( 2152): [6389]< RIL_REQUEST_SIM_OPEN_CHANNEL error: com.android.internal.telephony.CommandException: NO_SUCH_ELEMENT ret=
03-18 15:50:36.346 D/CAT ( 2152): CatService: handleMessage[2]
03-18 15:50:36.346 D/CAT ( 2152): CatService: ril message arrived,slotid:0
03-18 15:50:36.346 D/RILJ ( 2152): [6391]< SIM_IO IccIoResult sw1:0x90 sw2:0x0 [SUB0]
03-18 15:50:36.346 D/CAT ( 2152): CommandParamsFactory: process SelectItem
03-18 15:50:36.347 D/RILJ ( 2152): [6392]< SIM_IO IccIoResult sw1:0x90 sw2:0x0 [SUB0]
03-18 15:50:36.347 E/CarrierActionAgent( 2152): [0]Unsupported action: 7
03-18 15:50:36.347 E/RILD (12068): RefreshRegion: mOmcSalesCode(), mOmcCountry(), mOmcCountryISO()
03-18 15:50:36.347 E/RILD (12068): Onprocessing: request id(28), handleEvent(101)
03-18 15:50:36.347 E/RILD (12068): DoRouteOut - FW reqId : 28
03-18 15:50:36.347 D/RILJ ( 2152): [6393]< SIM_IO error 2 [SUB0]
03-18 15:50:36.347 D/UiccCard( 2152): Error in SIM access with exceptioncom.android.internal.telephony.CommandException: NO_SUCH_ELEMENT
03-18 15:50:36.348 E/RILD (12068): RefreshRegion: mCscSalesCode(), mCscCountry(), mCscCountry()
03-18 15:50:36.348 E/RILD (12068): RefreshRegion: mOmcSalesCode(), mOmcCountry(), mOmcCountryISO()
03-18 15:50:36.348 E/RILD (12068): Onprocessing: request id(28), handleEvent(101)
03-18 15:50:36.348 E/RILD (12068): DoRouteOut - FW reqId : 28
03-18 15:50:36.348 D/RilRequest( 2152): [6393]< SIM_IO error: com.android.internal.telephony.CommandException: GENERIC_FAILURE ret=IccIoResult sw1:0x0 sw2:0x0 Error: unknown

If this is an hardware issue we were unlucky. But as I can read in the discussion other users are reporting the same: Black Shade and kuromusha38 at least. It's reasonable this is something software related.

On the first build using a 4G switcher app I was able to restore connectivity on the latest miky build this trick is not working anymore.

Someone said this is root related. I'm not sure whether the ROM comes with root already enabled?