Any experience with iPhone X overheating?

overheating as in it's shutting down due to excessive heat or just getting warmer than expected?

see this article

Keeping iPhone, iPad, and iPod touch within acceptable operating temperatures - Apple Support

Phone overheated. Nothing running. Nothing would work. Phone kept closing the app, showing black screen with time out/WiFi circle in the middle of the screen. Couldn’t even do an update.

Appears mine was caused by the Activity app. Reset the phone and activity app disappeared, phone cooled down. Allowed me to do an update (11.2.1)which restored the activity app.

Got solution from here http://recomhub.com/blog/iphone-x-overheating-solution/