IGN has discovered a "game-breaking" bug in Metroid: Other M.
The bug leaves players stuck in Sector 3 if a certain door remains locked. It's not known what causes the error.
Contacted by the website, Nintendo customer support confirmed that it was aware of the issue, but that the only solutions were to load an earlier save, if available, or start the game again from the beginning.
Nintendo did not mention if a fix is planned, although IGN notes that it might be possible via a Wii firmware update.