4 sourced reports, with what to check before you buy. Each one links to the page it was reported on.
Costly or dangerous
Mini 4 Pro gimbal calibration stalls at 40% and gimbal quivers wildly
An owner on MavicPilots reports the gimbal calibration stalls at 40% and the gimbal then quivers wildly even on a drone that was never crashed. Forum replies attribute it to a bad gimbal motor or a failed signal cable, both of which need a repair shop.
What to check. A gimbal that will not calibrate and shakes violently makes the drone unusable for footage and requires a paid repair (signal cable or gimbal motor). Budget for service rather than assuming a reset will fix it.
Mini 4 Pro reports battery communication error on all three batteries after full charge
A Turkish complaint-site report (non-US source) describes a Mini 4 Pro that, a few months after purchase, began showing a battery communication error and 'battery too low, auto landing' on all three batteries minutes after a full charge, persisting after service replaced only one battery.
What to check. Some owners report a battery communication error across all batteries shortly after a full charge, forcing an auto-land warning. Note this is a non-US complaint-site report; if you see repeated battery errors, treat the batteries as suspect and push for a full set replacement.
Mini 4 Pro Intelligent Flight Battery release tabs break after a few flights
On Grey Arrows Drone Club, an owner reports the battery release tabs snapped after two flights; DJI replaced the battery under warranty. Other members describe the tabs as a design weakness with brittle plastic.
What to check. The battery's release tabs are fragile and can snap during normal removal. DJI replaced them under warranty in this case, but a broken tab can make a battery unusable, so handle removal gently.
Mini 4 Pro firmware update over RC 2 fails mid-way at 58% when batteries deplete
On PhantomHelp, an owner reports the over-the-air firmware update via the RC 2 controller failed at 58% because the batteries depleted during the update; it succeeded only when done over USB with DJI Assistant on a computer.
What to check. OTA firmware updates through the RC 2 can stall and fail if the batteries run low mid-update. Use a fully charged setup or update via DJI Assistant on a computer to avoid a failed update.
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 Drones catalog, version 0.1.1, under the CC-BY-SA-4.0 license.
