I'm gonna lose my mind.

Last week I did a factory reset. Everything was great for a few days. Then as of Monday, my phone no longer connected to mobile network. (I'm on Visible, which is a Verizon MVNO.)

I tried the same SIM card in another phone, and it worked — but a different SIM card did not work in my phone. So it must be the phone, right?

I looked at About phone > SIM card status:

• Network: Visible
• Mobile network state: Disconnected
• Service state: In service
• IMS reg status: Registered
• Signal strength: -113 dbm

Network Cell Info Lite app showed the nearest tower and:

• SIM state: Ready
• Service state: In-Service

I tried resetting network settings and restarting in safe mode, but that didn't help. Visible said to take the phone in to Samsung repair center.

So I did that. They ran a diagnostic, and said everything was fine. They said try factory reset again.
So I factory reset the phone, again, from recovery mode, wiping with cache several times.
After, service was working. Yay!

But then a few hours later, the battery died, and ipon powering back up, I AGAIN no longer have cell service!
Could it be related to adding a work profile? Enabling dev mode?
Any bloody idea what is happening??

I'm loathe to do another factory reset, as it takes me half a day to set up everything again (Work profile authentication, etc.)

Please help save my sanity.

Thanks!

 

> To test, simply wait for the problem to recur, then go to the other profile.
Not sure what you mean ... the issue is constant in both profiles. There is no 'recurring'.

>If nothing changes, try cycling airplane mode on and off.
>If you still have no service, then try restarting the device (not resetting).
I've done both of those things many times.

The only thing that fixed it the first time it happened was factory reset.

 

Yes I tried safe mode and it doesn't fix the issue.
As I mentioned I took her to repair centre in Iran a check on all the hardware and everything was fine.
How could I diagnose/ fix a corrupt system file?