I am having the same issue, both sending and receiving. Items I paid priority to receive, are taking 4-6 days instead of 2-3.
Items I have sent that end up in a sorting facility, no update to tracking for a few days, then show up finally to my customer after they think it is lost.
I have one order I shipped from here in Minnesota, to California, 3 days ago. Tracking stopped updating yesterday, last update was in Georgia.....Not sure why it is sitting in Georgia on the way to CA from MN.
Uuuuggggh. I hope USPS gets it in gear!