Galaxy S23 Ultra owners are seeing a strange pink vertical line appear after installing One UI 8.5. The issue surfaced on Samsung’s Community Forum, where a user confirmed the line showed up despite the phone being undamaged and water‑free. Alongside the stripe, the device randomly shifts font size, display scaling and flickers, turning a previously flawless screen into a glitchy mess still.

Other S23 owners have reported animation stalls, stuttering zooms and lagging UI transitions after the same update. Moderators suggested standard fixes—reboots, clearing cache, reinstalling the firmware—but none resolved the visual anomalies. Samsung has not issued an official statement, leaving users to wonder whether the problem is isolated or indicative of a broader regression in the company’s software quality control today.

The rollout began in early May, extending from flagship S25 and S24 models to the older S23 line. While Samsung has been praised for accelerating One UI updates, this incident underscores the risk of pushing major revisions to legacy hardware. Consumers should postpone the update until Samsung releases a corrective patch, as the current build compromises core usability.