This resulted in an occasional inability to place or receive phone calls and text messages, or access Siri. Since that's a primary selling point of the cellular-connected Apple Watch Series 3, it's a pretty big deal.
Apple told The Verge that a fix is coming.
"We have discovered that when Apple Watch Series 3 joins unauthenticated Wi-Fi networks without connectivity, it may at times prevent the watch from using cellular," Apple explained to The Verge. "We are investigating a fix for a future software release."
The issue comes when a user's Apple Watch Series 3 tries to automatically connect to a network saved by a Mac or iPhone, such as one inside a coffee shop or hotel that requires a web-based login, a source familiar with the matter explained to CNBC. A user can delete that Wi-Fi network from a list of saved networks to alleviate the problem.
It's possible Apple fixes this before the Apple Watch Series 3 begins shipping to customers on Friday. Also, keep in mind this doesn't affect the GPS-only model.