5 sourced reports, with what to check before you buy. Each one links to the page it was reported on.
Costly or dangerous
Dishes come out dirty on the 3.5-hour program despite normal settings and different detergents
A 1.5-year-old unit stopped cleaning dishes on the long program despite normal salt/rinseaid and several detergent brands; Samsung called it user error and refused warranty help.
What to check. Poor wash performance is a recurring reported failure; if it appears, test with multiple detergents before assuming user error, and be prepared that Samsung may reject the claim.
Machine leaked 2-3 litres of clean water from underneath while switched off
A unit leaked roughly 2-3 litres of clean water from underneath even while switched off; the owner was quoted a 2200 TL service fee due to technician distance.
What to check. A leak while off points to a water-path or seal fault, not user loading; this can be costly to diagnose if the nearest authorized service is far.
Rinse failure leaves detergent residue and film on glassware from the second wash
A new unit left detergent residue and film on glassware from the second wash on every program; Samsung service refused to accept it as a fault.
What to check. If you buy this model, verify rinse performance early and keep records; the owner reports Samsung service disputed the defect and offered only a paid follow-up visit.
Abnormal noise and an obvious manufacturing defect within the first week
A brand-new unit showed abnormal running noise and an obvious interior manufacturing defect within a week; Samsung offered a paid replacement instead of a free one.
What to check. Inspect a new unit immediately and report noise/defects within the warranty window; the owner reports Samsung proposed a paid exchange for a factory-defective machine.
Internal rust appeared inside the tub while under warranty
The same owner reported rust forming inside the tub; the authorized service only surface-cleaned it and Samsung rejected the warranty claim as user error.
What to check. Interior rust on a machine still under warranty is a defect worth documenting with photos, as the owner reports Samsung disputed it.
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 Dishwashers catalog, version 0.1.2, under the CC-BY-SA-4.0 license.