Apple has announced that it will be be extending free repairs on the first generation Apple Watch if your devices is suffering from a problem with a detached back cover.
The company is now offering repairs for this issue on the Apple Watch for up to three years from the original purchase date.
Apple has determined that under certain conditions on some Apple Watch (1st generation) devices the back cover may separate from the watch case. Apple will service eligible devices free of charge. Apple will authorize coverage for three (3) years from the date of purchase.
If you have has this problem with your first generation Apple Watch and want to get it repaired, you need to either take your device to your local Apple store or give their customer service a call.
Source MacRumors