On top of the recent slew of updates, the guy's at Disney rebalanced turrets today. Most importantly, Mortar turrets got nerfed - they should be weak against everything except infantry now. Most players were simply create bases of all or mostly mortar turrets that were nearly impenetrable and most attackers simply skipped those bases.
For level 5+ players who invested in all Mortar bases, it won't be cheap to swap them. Luckily, the time to swap is just a few minutes.
In addition to mortar turrets, there also the following changes:
Increase the damage against infantry bruisers and vehicle bruisers. (counters all wookie/chewie army)
Increase the turret’s range to 10. (counters all AT-AT army)
Lower damage of the turret to compensate for the additional range.
Lower damage ratios against infantry, bruiser vehicles and lower it even further against infantry bruisers.
Lower the damage ratio against vehicles, bruiser infantry and lower it even further against vehicle bruisers substantially.
Good luck with the rebalance. Let me know you're thoughts.