The game has some issues because of the system to get players. Once you are playing longer you have almost all possible players but some you have 2, 3 or 4 times, even if you do not use these players.
Since the upgrade has become so expensive it would be great if we could sell players we do not want/need. This gives players to use the players they want and to upgrade them. Now you have a lot of unwanted players and the players you want don't receive the upgrades as fast as it could be. It's also not realistic since no real life team has a bench of 10 players.
PS Where are the release notes from the latest update? there is a lot more that has changed than bugfixes. The defensive side has become much harder and the advantage of the players in winning strek has become bigger.