Nest Labs is halting sales of its new Protect smoke detector after determining that one of its flagship features could accidentally delay its alarm from going off during a fire. The feature, Nest Wave, allows homeowners to wave at the Protect to turn off its alarm, should it sound when there isn’t actually an issue. Nest has now found that this feature could be unintentionally activated. It hasn’t had any reports of this happening outside of a lab, but it’s preemptively halting sales and deactivating the feature on existing units with the hope of avoiding it. All Protect smoke detectors that have already been sold will automatically update and deactivate the feature within 24 hours if they’re connected to the internet, Nest says, otherwise, homeowners will have to connect and update it themselves. Nest is also offering refunds.