I think close to the end of Eternal 500 I received 3 errors on one battle... APMA06 came up when opening attack list, restarted game in fear of bad connection to server. Failed my login due to error, then at the end of the battle I got APMA03.
It is rather extremely annoying than having any huge impact on my ranking or trooper points or anything (thank god).
I just wish for a bug-free day. 11 months since global launch