6 sourced reports, with what to check before you buy. Each one links to the page it was reported on.
Apple acknowledged the green/yellow horizontal-line flash on unlock and attributed it to an iOS 16 bug rather than hardware.
What to check. If the line flash appears on unlock, update iOS before assuming a hardware fault; it is a known, acknowledged software issue.
Reported on: tech.hindustantimes.com
A repair thread ties an SMC PANIC failure on the 14 Pro Max to battery communication, noting a non-OEM battery triggers a warning.
What to check. If the phone restarts with an SMC PANIC log, the battery is a likely suspect; use an Apple-sourced battery to avoid the non-OEM warning.
Reported on: it.ifixit.com
A user reports battery performance worsened after the iOS 26.5 update, dropping from 100% to 48% by lunchtime.
What to check. Treat post-update drain as a software regression first; the phone's battery health should be checked before replacing the battery.
Reported on: in.mashable.com
Turkish owners report one or more green lines flashing on the screen when the device is turned on, disappearing after a few seconds; Apple's support unit said the cause is software.
What to check. Turkish-market buyers seeing a green line flash on wake should try an iOS update before seeking a panel replacement.
Reported on: hwp.com.tr
A repairer reports the phone overheats and restarts within 5 minutes of use after a battery replacement.
What to check. Overheating and self-restart after a battery swap points to a faulty or incompatible battery; verify the replacement battery and flex cables before blaming the phone.
Reported on: it.ifixit.com
An owner reports the device restarts abruptly on iOS 18.2.1 and stalls at the Apple logo when charging.
What to check. Abrupt restarts and a stall at the Apple logo are reported on iOS 18.2.1; try a force restart and update iOS before assuming hardware failure.
Reported on: developer.apple.com
Kriko reads a listing and tells you which of these apply to that exact product. It runs on your computer, needs no account and is free.
These reports come from the pages linked under each item: owner forums, repair guides and workshops. They are not a diagnosis of any one unit, and a careful check of the one you are buying still applies.
Text from the Kriko Smartphones catalog, version 0.1.1, under the CC-BY-SA-4.0 license.
