Apple Inc. (AAPL) stock fell 2.3% midday Wednesday, Sept. 20, after reviewers of its upcoming Apple Watch Series 3 reported trouble connecting to a cellular network, The Verge reported.

The Series 3's biggest selling point was that it's the first of its kind that has built-in cellular capabilities, meaning it doesn't have to be tethered electronically to a cellphone to operate on the network. A reviewer from The Verge said the watch had "notable connectivity issues" and appeared to connect to unknown Wi-Fi networks instead of operating on LTE when out of range from the user's phone as advertised.

The reviewer complained to Apple, which sent a replacement watch. But the replacement experienced the same problems. Apple released a statement shortly after, acknowledging that when the Apple Watch Series 3 "joins unauthenticated Wi-Fi networks without connectivity, it may at times prevent the watch from using cellular."

Apple told The Verge's reviewer that it's working to fix the problem for a future software release. The current version of the Series 3 watch is set to ship on Friday, Sept. 22.

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