Although Samsung Galaxy S8 broke some records including the number of preorders, users already have noted several problems with working of the device. Few days after premiere of Galaxy S8 people complained about red tint of display. Samsung quickly reacted on this info and released an update which solved the problem, but as it turns out, it's not the end of the issues.
Few users noted that their phones automatically restart. Reason why it's happening is unknown. Some of them say that microSD card is guilty, other people blame Always-On Display and power save option. For now Samsung hasn't taken a stand in this case.