When you track it does it say USPS parcel select ground? I never had any issues with shipping until I ordered something on EBay back in May.
I didn't need it right away. But I live on the east coast, and saw that package get close to my state, then move more north than necessary, west for no reason, then a few days of no updates. I called USPS, they were like based on the information I have, I think this package is here, awkward pause included like they wanted me to confirm their answer to my question.
It's the bologna of shipping. I think they throw your package into anything that moves: train, truck, plane, car, and one day it will arrive.
USPS Parcel Select Ground: Rates & Tracking | Easyship Blog