My 1 of 3 acc got banned after MA.
The banned acc life long for around 3 months.
All 5* max lvl and 2 T1 lvl 62.
Clear chapter 6 hard mode to try hell mode and see what its rewards.
2 Conquest with hell mode clear for farm exp.
Royal Vault at floor 39, ToC and ToO always cleared before times up every week and month, never do arena.
In guild and friends with only my 3 acc.
Conclusion, maybe the cause is hell mode.
Tips, dont actived the mod in MA day before the MA over.
Sorry for bad english n grammar.