After the issue with red tint on some Galaxy S8 units, turned out rather minor, early adopters with of the Galaxy S8+ are faced with another problem. Reportedly, when the phone is placed on Samsung's Wireless Charging Pad, it either charges slowly or does not fill up the battery at all. Some say that they can charge the Galaxy S8+ with a non-Samsung branded pad. Others just get a notification saying the wireless charging has been paused. It's uncertain what percentage of units are affected. Samsung is yet to acknowledge the wireless charging issue. Source
Source: http://www.gsmarena.com/galaxy_s8_users_report_trouble_with_wireless_charging-news-24718.php