I'm in the same boat right now. I ordered an item with Prime this week, and it's using a UPS > USPS > Doorstep methods that never used to happen for me (it was always just UPS straight to my house without any problems). Apparently UPS delivered the item to the wrong Post Office, and the item has been delayed. I ordered the item on Saturday, July 26th and now after the fuckup by UPS/USPS, the second tracking number tells me that the expected delivery is Saturday, August 2nd.
With this UPS > USPS fuckery that is bound to introduce more problems than it is worth, it's just not worth it to keep paying for Prime after it expires this year for me.