A bug discovered in Apple Watch Series 4 is reportedly crashing the device and causing it to get stuck on re-boot loops, the media reported.

"The Watch reboots itself repeatedly, as long as the 'Infograph Modular' face is active with the 'Activity' complication. Every time the device boots, it tries to load the complications again, fails and restarts. This continues indefinitely until the watch runs out of power," 9To5Mac reported late on Sunday.