The Apple Watch's heart monitor, which is supposed to consistently record a user's heart rate every 10 minutes, began to track data at longer and more irregular intervals after receiving a recent update.

Apple's new support page insists that the bug, which specifically addresses the device's heart rate features, says this is actually intentional. 

Apple said that the wearable will still attempt to track your heart rate every 10 minutes, but won't record it if your arms are moving [you really can't make this stuff up].

Users can also still check their heart rates by manually checking its Heart Rate Glance feature, and the device will continue tracking heart rate during a workout. Or they could buy something cheaper which operates as advertised.

It is not clear why Apple thought this was a good idea. Cutting down the sensor's frequency may help to increase the device's already terrible battery life. It might just be that the whole product is broken by design and Apple has not got a clue how to fix it.