Why? Could it be to try and avoid bankruptcy? Usually, asset selling is a first when trying to stave off the inevitable and the company has been doing some selling. Maybe their in over their heads and finally realize. On July 24th the numbers will come out and we'll all find out how many more customers was lost. If this trend continues, Att has no hope and can thank the upper echelon for poor business decisions.
https://finance.yahoo.com/news/t-considers-selling-regional-sports-164644687.html