Usually 'brownout' refers to a situation where an electrical grid is failing to provide sufficient power but is still providing some. It's not quite a blackout,

Usually 'brownout' refers to a situation where an electrical grid is failing to provide sufficient power but is still providing some. It's not quite a blackout, but its also not functioning properly. In this context it's referring to a transitory period where a feature is in a state of flux and may only partially work.