UPDATE (May 17th, 2018):
Samsung has officially paused the Android Oreo update rollout for Galaxy S7/S7 edge users in the United Kingdom. The decision has been taken after a few of the users complained about random reboots after the update installation. The team said that even though the number of affected users is currently very small, they want to minimize the overall impact which is why update rollout has been halted for the time being. It will be resumed once the cause of the issue will be discovered and fixed but there is no specific timeline as of now.
If you are one of the users who experienced the issue, you can refer the screenshot added below to read about some troubleshooting tips.
17/05/2018 08:15 AM