It seems like some Galaxy S8 (Plus) units are having issues with autofocus while taking images, which results in blurry photos. Quite a few users reported such issues on the company's official forum, and it seems like this issue applies to both the native camera app, and third-party camera apps, no matter if we're talking about actually third-party camera apps, or the ones that you can use in Snapchat, Facebook, and so on (integrated ones).
Now, users have been reporting such issues for a while now, it seems like this problem isn't new, and a Samsung moderator actually responded to such issues, trying to help out users. He suggested that users updated all the apps, both in the Google Play Store and the Galaxy App store. He also suggested that you check if your phone is up to date, and if that doesn't work, you should try taping the back of the device, or give it a small shake. If that doesn't work, try clearing application caches and application data, and the same goes for the phone cache. If none of those solutions do the trick, you'll have to send your phone for an evaluation and repair, unfortunately. Now, based on the answer on Samsung's Forums, some users actually found these suggestions useful, as it managed to fix their issues, others, not so much. Samsung's moderator did not elaborate on the issue, he did not specify if this is a software or a hardware problem, based on its fix tips, it could be either one of those. If you take a look at image down below, you'll be able to see an example of a blurry image that we're talking about here.
The Samsung Galaxy S8 and S8 Plus had been introduced back in April, and they're still the company's flagship phones, in addition to the Galaxy Note 8, of course. These two phones are made out of metal and glass, and they sport QHD+ Super AMOLED Infinity displays. Both phones ship with 4GB of RAM, and they actually come in two different SoC variants, some Galaxy S8 / S8 Plus phones are fueled by the Exynos 8895, while others come with the Snapdragon 835, depending on where you buy your unit. If you'd like to know more about the Galaxy S8 and / or Galaxy S8 Plus, check out our full review of these two phones.