Apple isn’t the only company incapable of releasing software free of bugs. After months of development, Samsung mysteriously halted the highly anticipated rollout of Android Oreo for the Galaxy S8 and Galaxy S8 Plus, and we now know why.

According to Samsung, a small number of users have reported the update is causing their device to unexpectedly reboot. Samsung sent a statement to SamMobile confirming the news. Unfortunately, it doesn’t appear the company knows what’s causing the issue.

Following a limited number of cases where Galaxy S8 and GalaxyS8+ devices have rebooted unexpectedly with the Android 8.0 Oreo, we have temporarily stopped the rollout of the update. We are investigating the issue internally to ensure that the impact to the affected devices is minimized and the rollout of the update can resume a quickly as possible.

Although details about what’s causing the issue weren’t shared, SamMobile claims Samsung is already working on a newer version of the update. For users who have already updated, it appears they’ll have to endure the buggy software until a fix is released.

The release of Android Oreo for the Galaxy S8 and Galaxy S8 Plus introduces Samsung Experience 9, which includes new emoji, improvements to Bixby, and more.