7 sourced reports, with what to check before you buy. Each one links to the page it was reported on.
Costly or dangerous
Galaxy A15 fast charging drops to normal charging and charging takes hours (TR market)
The Şikayetvar complaint page lists ~30 charging complaints for the A15, several describing fast charging dropping to normal charging within a minute and full charges taking 2-7+ hours, some within warranty.
What to check. If buying new, this is the most-reported TR-market fault; test fast charging within the return window. If owned, a slow-charge unit is a warranty claim rather than a DIY fix.
Galaxy A15 touchscreen becomes unresponsive, blocking calls and photos
An owner review (collected on Google Shopping, reviewer 'Bradgh') reports the touchscreen suddenly becoming unresponsive on multiple occasions, making calls and photos impossible, and requiring a full restart. A separate Turkish complaint on Şikayetvar ('dokunmatik') reports the same touchscreen trouble.
What to check. Unresponsive touchscreen is a serious usability fault; a buyer should test the touchscreen thoroughly in the return window, and an owner should treat it as a hardware/warranty claim.
Galaxy A15 overheats after ~20 minutes and camera shuts down from overheating
An owner review on Samsung's official product page (German review) reports the device getting hot after ~20 minutes and the camera switching off due to overheating; Samsung's own reply acknowledges abnormal warmth and recommends an authorized service check.
What to check. Overheating that disables the camera is a hardware/thermal fault worth a service-centre check; a buyer should verify sustained camera use in the return window.
Galaxy A15 screen intermittently appears and disappears (flickering)
An owner review on Samsung's official page reports the screen frequently appearing and disappearing intermittently, a display fault consistent with the flickering/panel issues repair guides describe for the A15.
What to check. Intermittent screen dropouts point to the AMOLED panel or its connection; a buyer should check the display during the return window and treat a flickering unit as a warranty/return case.
Green line on screen reported after an update (5G variant, same A15 family)
A Samsung Community thread reports a green line appearing after a December update — but explicitly on the Galaxy A15 5G (SM-A156E), not the 4G model in this subject. I could not confirm this specific fault on the 4G unit, so treat it as a same-family signal rather than a confirmed 4G defect.
What to check. The green-line fault is documented on the A15 5G sibling; for the 4G model this remains unconfirmed. A buyer should check the display for vertical lines during the return window regardless.
One UI 7 update makes Galaxy A15 overheat and drain battery faster
An owner review (Spanish, reposted on Samsung's Finnish page) reports that after installing One UI 7 the phone overheats and the battery drains faster; the same reviewer also reports missing autofocus.
What to check. A software-update regression is the most likely cause here; a buyer should check whether the unit ships with or has received One UI 7 before judging battery/thermal behaviour.
Galaxy A15 wired-headphone audio stutters, unfixed for over a year
An owner review on Samsung's official page reports audio stutter with wired TRS headphones that persisted for over a year across updates; Samsung's reply blames dust/headphone compatibility.
What to check. Lower-severity issue: if the buyer relies on wired headphones, test the jack early; otherwise it is a nuisance rather than a dealbreaker.
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.
