I don't know exactly what is going on, but I can relate my personal experience with a recent trip.
I had a court date in Ridgway, PA scheduled for Thursday June 23rd, so I bought tickets to Pittsburgh and back, planning to drive from Pittsburgh to Ridgway and back.
The first odd thing was when I tried to check in Tuesday, my reservation was confirmed but my seat assignments had disappeared. I was able to reselect my seats but at an additional cost of $58.
My flight up was IAH to DFW then DFW to PIT. The second flight was delayed by an hour because they had to replace the flight crew. I had the same thing happen during a return flight in February.
Coming back Friday, I had no issues on the flight from PIT to ATL, but in Atlanta the flight to Houston was overbooked by 29 people, and no one wanted to get off. I did notice one odd thing which may, or may not, have been a stunt:
As I got off the flight from Pittsburgh, I noticed my boarding pass for the flight to Houston had disappeared from my phone. So I walked down to the gate for my flight and asked for them to print our my boarding pass. A few other passengers did the same after me. I walked down to McDonalds and got some breakfast, and when I got back to the gate, passengers were less than happy, as the gate workers for some reason could no longer print out boarding passes; people would have to go all the way to the ticketing area for a printed boarding pass, but they were sure the boarding passes would be available on their phones again before too long.,
From comments by my fellow passengers who were able to board, the phones showed boarding passes for the First Class and priority customers, but the main cabin customers had to wait for the gate attendants to confirm their seat, unless of course they had a printed boarding pass as I did.
Whatever that was about, it was weird.
That which does not kill me, will try again and get nastier