5 sourced reports, with what to check before you buy. Each one links to the page it was reported on.
Costly or dangerous
Fakir Airfry stops mid-cycle and will not restart; two service visits did not fix it
Owner reports the unit stops mid-cycle and will not restart, and that two service visits failed to resolve it.
What to check. This is the most-reported Fakir Airfry fault. If buying, expect that a mid-cycle shutdown may not be fixed by warranty service; keep the receipt and be prepared to push for replacement rather than repair.
Fakir Airfryer interior plastic coating flakes into the food
Owner of a dual-basket model reports the interior plastic lining crumbling like flour into the food after about 4 years of use.
What to check. A health-relevant surface failure: degraded interior coating contaminating food. This appears after years of use, so it is a longevity concern rather than a first-use fault.
Owner reports potatoes staying raw and not browning across three attempts, and requested a refund/replacement.
What to check. Uneven/under-cooking reported on a new unit. If you buy, test with a simple batch (e.g. frozen fries) within the return window, since the seller directed this owner to service rather than a refund.
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 Air fryers catalog, version 0.1.2, under the CC-BY-SA-4.0 license.