UPDATE  2024-03-22, 14:10 UTC: The issue has been fixed now! Please establish a fresh connection to the game. 

2024-03-22, 11:40 UTC:  There is a known issue with the Hero Daroga's "Echoes of the Opera" stacking Attack Boost. Currently, the effect of the Stack is limited to 4 turns. Stacks should not have turn limits unless explicitly stated. We are working to fix this as soon as possible.

Our apologies for the inconvenience caused by this.