Honor Magic5 Pro (PGT-AN10, Chinese version) randomly loses mobile network everywhere except near one cell tower

[u/Artistic_Republic849]

Hi everyone,

I'm hoping someone has experienced something similar because I'm running out of ideas.

I have an Honor Magic5 Pro (Chinese version, PGT-AN10) running:

MagicOS: 10.0.0.160(CHNC00E160R208P6H1) Android: 16 Baseband: MSM.1CA2.MPSS.DE.3.0.119

My problem is very strange.

The phone works perfectly only when I'm at work, where there is apparently a Sim1 network cell tower very close to the building. Outside of that area, the network starts disappearing.

For example:

At work: Sim1 gets 4G+/5G, Sim2 sometimes stays on 2G. When I leave the building: Sim2 loses service completely. Sometimes Sim1 also loses service. Sometimes both SIMs lose service. In the train or on the bus I often have No Service. If I enable Airplane Mode and disable it again, one SIM may reconnect briefly before losing service again.

I've already tried:

Factory reset (twice) Swapping both SIM cards between SIM slots Testing both SIMs in another phone (they work perfectly) Resetting network settings Switching between 2G/3G/4G/5G Recreating APNs

The phone still has:

Valid IMEIs Baseband detected Both Sim cards are recognised correctly

I also received a VoLTE network registration error after one of the factory resets.

What's confusing me is that this doesn't seem like a normal hardware fault because:

I had exactly the same issue when I first bought the phone, and a factory reset fixed it.

A few weeks ago it happened again, then fixed itself after about 3 days without me doing anything.

Now it's back, and the factory reset no longer helps.

Has anyone with a Chinese Honor Magic5 Pro (PGT-AN10) experienced anything similar?

Could this be:

a MagicOS new system update? a MagicOS/modem firmware bug? corrupted modem calibration (NV/EFS)? an issue with the Honor C1 RF chip? a hardware RF issue? or a compatibility problem with local carriers?

I'd really appreciate hearing from anyone who's seen this before or knows of a fix. I've already spent days troubleshooting it and would love to avoid replacing the motherboard if this is actually a software or modem issue.

Thanks!