iPhone 12 ProMax No Service issue after 14.5, stil happens in 14.6
I have an iPhone 12 ProMax, I use DualSIM with T-Mobile/AT&T.. Ever since 14.5 (when Standalone 5G was enabled).. if I leave the phone in airplane mode for an extended amount of time (I work for an airline, and do this for a few hours.. 1-4 times a day when working), when I take it out of airplane mode.. it will say "No Service" until I reboot the phone.
I've Tried:
1) DFU software re-load through my mac, thinking an upgrade did not go as expected..
2) removing the AT&T SIM and doing single SIM service (T-Mobile is primary).
3) Moving the T-Mobile service to a physical SIM for a week (it's back on eSIM now).. still the same result.
4) Resetting Network Settings
I'm not sure what to do, as this iPhone 12 is absolutely the worst iPhone I've had as far as network connectivity. I've got a 2020 iPhone SE we keep around the house in case someone breaks the phone.. with the same T-Mobile or AT&T SIM cards.. it does not have the "No Service" problem.
I'm not eager to take it to the apple store, as i'm sure it'll function fine when there.. but needing to reboot my phone every time we land and i've got some sit time.. or just want to quickly check if I have messages is quite annoying, this week i'm carrying the iPhone SE with my SIM in it because it at least "works" but this screen size is horrible after getting used to a 12 ProMax.
Any suggestions on how to actually fix this? As i'm sure it's more of a baseband/software issue that came along with SA 5G being enabled.