In an unexpected twist, Apple has canceled its long-delayed AirPower wireless charger, citing quality problems.

“After much effort, we’ve concluded AirPower will not achieve our high standards and we have cancelled the project,” Apple senior vice president Dan Riccio says in a prepared statement. “We apologize to those customers who were looking forward to this launch. We continue to believe that the future is wireless and are committed to push the wireless experience forward.”

Apple announced the AirPower wireless charging mat in September 2017, alongside the iPhone X, 8, and 8 Plus, and said that it would release the device sometime in 2018. That never happened, though a report in mid-2018 noted that the device would be delayed until the second half of the year.

Then that didn’t happen, and the 2018 holiday season came and went with no word—let alone no product—from Apple. In January, there were rumors that production had begun. Then, code in the beta version of recently-released iOS 12 suggested a release was imminent.

So that’s obviously not happening now. And it’s unclear exactly what the problem was, though I find Apple’s statement above a bit contorted, as if the AirPower had somehow let down the company.

I guess it was a hard computer science problem.