Amazon Prime could face investigation over delivery complaints

This is purely anecdotal but lately I've been getting more and more delivered via Amazon's own carrier service. 100% of the time it is late. Some things have completely disappeared and never left the SF carrier facility. It's made me not order from Amazon a handful of times this past week out of being burned on a consistent basis.

It seems very un-Amazon of them. They clearly have the metrics to track this so I'm shocked they aren't diverting or doing something to fix the problem, whether that's incentivizing slower shipping or using other carriers (I realize the carrier deals they have are very complex and affect a whole load of other data points).

It's just odd to me that consistently the Amazon delivery service is what is being used and that it's consistently bad/delayed/etc.