Seeing your phone continually restart would concern me as well, WALAPACE. We want to make sure we figure out what is causing this to keep happening. Was there any change to the phone when this started? For example, a new software update, new apps, new accessories, etc.? When you say restart, does the whole phone shut down and come back up, or does just the app close out on the phone? Is there any physical or liquid damage with your device? Are you getting any errors before your S8 restarts?
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did you download a new app/s before the issue?