Are you using a third party LAN adapter on your Switch dock" If so, you might not want to leave it plugged in when your system goes to sleep. Reports are coming in from some users who have noticed that their Switch was hot to the touch when left in sleep mode in a dock with a LAN adapter attached. When they removed the LAN adapter, the Switch was no longer heating up in the dock. Anyone else out there experiencing this issue"
QUELLE und TEXT: https://gonintendo.com/stories/308304-third-party-lan-adapters-might-be-causing-trouble-for-the-switch

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