https://www.techradar.com/news/samsung-galaxy-s8-android-oreo-update-gets-delayed-at-the-last-minute

Android Oreo on your Samsung Galaxy S8 seemed mouth-wateringly close, but it's recently been delayed due to an unexpected bug that caused some phones with the software to mysteriously reboot.

The issue, which wasn’t discovered during the company’s extensive beta period for Oreo, is said to target both the S8 and Samsung Galaxy S8 Plus, though the company stated that it only discovered “a limited number of cases” of phones affected, according to a statement received by SamMobile.