As I understand it, the shipping inconsistencies are due to the rollout of their own delivery fleet. I canceled prime when my prime deliveries started taking a week to arrive, but I ended up rejoining when I noticed a fleet of amazon vans in my area. I'm now back to 1-2 day deliveries, which is great because I am in a rather rural and isolated area. They reportedly built a small (for them) distribution hub to service two counties with <200k people.