9 sourced reports, with what to check before you buy. Each one links to the page it was reported on.
Costly or dangerous
Phone restarts on its own, runs very hot, suspected mainboard damage
A Samsung community thread (Polish) documents an A55 that began turning itself on and off, ran very hot, and entered a broken state; another member concludes it looks like mainboard damage and advises a service visit. This is a hardware failure report, not just a software glitch.
What to check. If your A55 starts randomly restarting and running hot, treat it as a possible hardware fault and get it checked at a service centre rather than assuming a software fix will help.
Post-update firmware error leaves phone unusable on a green screen
A German user reports that after an update the A55 became unusable, showing only a green screen with a firmware-error message. The repair-shop response says the firmware must be completely reflashed. This is the most severe software finding: a failed update can soft-brick the phone and require a reflash.
What to check. Back up before major updates; if the phone lands on a green firmware-error screen, the fix is a full firmware reflash, not a simple restart.
Battery heats up within minutes of use, with a prior A32 battery swelling
From the Samsung SI review page (originally posted on Samsung Italia). A buyer reports the A55 battery gets warm within 5 minutes of use and recalls that the same behaviour on an older A32 ended with the battery swelling. This is a single owner report, not a mass failure, but it flags a heating pattern worth watching.
What to check. If you buy an A55, watch for the phone getting hot during ordinary use; persistent heat over months is the warning sign that preceded a swollen battery on this owner's previous Samsung.
A German user reports the A55 repeatedly shows a 'cannot update' message and points to Smart Switch even though Smart Switch is installed. A repair-shop pro (aetka) attributes it to the update channel or device configuration, and suggests updating via PC. This is a software/update-channel annoyance, not a hardware fault.
What to check. If you hit this, the shop's fix is to update through Samsung Smart Switch on a PC rather than over-the-air.
Exynos cellular network problems and weak 5G reception
A GSMarena user review reports cellular network problems and heat with the Exynos chip, and a specific pattern of weak 5G reception in moderate-coverage areas (4G is fine). This matches a separate report of hotspot/5G issues. Reception quality is a real, if usage-dependent, concern.
What to check. If you rely on 5G in areas with patchy coverage, expect weaker reception than on 4G; several owners work around it by forcing 4G.
Overheating during video calls and lagging after ~1.5 years
A Polish owner reports the phone got very hot during video calls from day one and now, after 1.5 years, frequently freezes and lags. This is an independent owner account (not a Samsung page) that ties heating to a long-term performance decline.
What to check. If you make long video calls, expect noticeable heat; the owner also reports the device slows down after roughly a year and a half of use.
A Turkish owner on Samsung Türkiye's own review page reports an 'update paused' error on a one-year-old A55, and notes Samsung has no service centre in his city. This is a software-update reliability complaint from the Turkish market.
What to check. Turkish buyers should note that update errors occur and that Samsung service coverage can be thin outside major cities.
A Turkish owner on Samsung Türkiye's page says the A55 takes worse photos than his older A32. This is a subjective quality complaint rather than a defect, but it is a recurring theme in several reviews (camera disappointment).
What to check. If camera quality is a priority, compare sample shots before buying; several owners find the A55 camera underwhelming.
Screen touch sensitivity: over-sensitive or misses touches
A Samsung UK review reports the A55 screen is sometimes over-sensitive and sometimes fails to register touches. This is a minor, low-severity display/interaction complaint, not a widespread display failure.
What to check. Minor touch sensitivity quirks are reported; if they bother you, a screen-protector or sensitivity setting change may help, but this is not a common defect.
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.
