6 sourced reports, with what to check before you buy. Each one links to the page it was reported on.
Costly or dangerous
Klipper update via Fluidd froze the Ender 3 V3 KE screen (brick-like state)
An owner updated Klipper through the Fluidd interface and the printer froze on the boot screen, with Klipper inaccessible and a USB firmware update not taking; the thread ends with a factory-reset method restoring the machine.
What to check. A failed or interrupted firmware/Klipper update can leave the machine stuck on the boot screen; recovery needs a factory reset or the official wire-flash (brick rescue) procedure, so keep the recovery toolchain in mind before updating.
Nozzle refuses to heat after ~1200 hours on Ender 3 V3 KE, thermistor suspected
An owner reports the nozzle refusing to heat after about 1200 hours of printing, with the temperature probe suspected; the thread links to a thermal-runaway / heating-not-as-expected report and notes a full hotend kit costs roughly 30 EUR.
What to check. After heavy use the hotend can stop heating (thermistor or heater failure), which halts extrusion entirely; a replacement hotend kit is inexpensive but the printer is down until it arrives.
Hotend nozzle and heat block clog repeatedly on Ender 3 V3 KE
A new owner reports the nozzle and heating block clogging repeatedly within days, even after replacing the nozzle and purging; forum replies point to heatbreak cooling and hot-tightening of the nozzle as the cause.
What to check. Expect to clear nozzle clogs and check the heatbreak fan and hot-tightening of the nozzle early on; a clogged hotend stops extrusion entirely and costs time and replacement nozzles.
Layer shifting on Ender 3 V3 KE (loose belt, loose extruder kit)
Creality's official Japanese troubleshooting guide lists layer shifting as a known issue, with loose belts and a loose extruder kit among the named causes.
What to check. Layer shifting is a maintenance item (belt tension, extruder mounting screws) rather than a defect; it shows up on large prints and is fixable by tightening.
Error key 2111 'Unknown Exception' at print start on Ender 3 V3 KE
Creality's own wiki documents a 2111 'Unknown Exception' error at print start, attributed to wrong start G-code or not selecting the Ender-3 V3 KE model in the slicer.
What to check. A 2111 error at print start is usually a slicer/profile mismatch, not a hardware fault; using the correct model profile and default parameters resolves it.
OTA firmware update fails on Ender 3 V3 KE ("Echec de l'installation")
An owner reports the over-the-air firmware update repeatedly failing with an installation error on screen; the thread's resolution was to flash the same firmware from a USB stick instead, which succeeded.
What to check. OTA updates can fail and leave you on an older firmware version; the workaround is a USB-stick flash, so this is an annoyance rather than a bricking risk.
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 3D printers catalog, version 0.1.1, under the CC-BY-SA-4.0 license.
