Some Apple Watch models over time may develop swollen or expanded batteries, especially older models such as the original Apple Watch and Apple Watch Series 1 and 2.
Apple offering free repairs of 42mm Series 2 watches with battery problems

Some Apple Watch models over time may develop swollen or expanded batteries, especially older models such as the original Apple Watch and Apple Watch Series 1 and 2.
On March 29, 2018, Apple released the tvOS 11.3 software update, bringing the ability to play videos in their original frame rate to owners of the fourth-generation Apple TV, plus other improvements such as ad-free music videos for Apple Music members right in the Music app.
On March 29, 2018, Apple released the watchOS 4.3 software update for Apple Watch. Among other improvements and fixes, watchOS 4.3 reinstates the ability to browse music on your paired iPhone via your wrist while enabling new features like portrait Nightstand mode.
On Thursday, March 29, 2018, Apple released the iOS 11.3 software update for iPhone, iPad and iPod touch with battery health assessment in Settings, the ability to disable Apple's controversial CPU throttling at will and other new features.
The QR code scanning feature in the stock Camera app suffers from an odd parser bug.
Hundreds of iPhone X owners have been complaining recently about an unusual bug that's causing them to miss incoming calls because the handset's OLED display won't wake, preventing the call from being answered.
Although iOS 11.2 has addressed a Calculator bug that caused input to be lost if you typed too quickly, iOS 11.3 brings back the button fade animations without reintroducing this issue.
This post will have limited appeal to the vast majority of iDB readers because it addresses a very specific issue, but I figured I had to put it out there to help those who encounter it.