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Don’t throw away your dumb old smoke detector just yet. Nest announced today that it has detected a bug in its Nest Protect Smoke + CO alarms which could shut off the device entirely. The Google-owned company is halting sales and has issued a voluntary recall for all 440,000 units sold to date.

The problem is related to a Nest feature called Nest Wave that allows users to silence the smoke detector with the wave of a hand in front of the sensor. “During recent laboratory testing of the Nest Protect smoke alarm, we observed a unique combination of circumstances that caused us to question whether the Nest Wave could be unintentionally activated,” Nest CEO Tony Fadell said. “This could delay an alarm going off if there was a real fire.” Fadell said the company hasn’t received any reports from customers that this has ever happened, but wants to err on the side of caution.

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The Associated Press is reporting that Nest has issued a recall for “440,000 smoke alarms” over the issue, but it’s only voluntary and only because Nest Connect ships with the Nest Wave feature on by default. Nest outlines how to disable the wave-to-silence feature and promises to issue a software fix as soon as possible. It says the patch will take two to three months, as it will require approval from safety boards in the United States, the U.K. and Canada.

In the meantime, customers who’ve already purchased a Nest Protect are also eligible for a full refund if they prefer.

Source AP, Nest