Message sometimes not saved in MAM

Hi guys,

Currently I used Ejabberd 16.02 with clustering and mysql database to serve my chat application, Ejabberd server and mysql database was hosted in AWS. There is an issue recently, some message is not saved in MAM but Ejabberd return ack so the user think the message is sent, and after I check Ejabberd log there is no error log that I think related to this issue. Is there anyone that can tell me what factor in Ejabberd that can make message not saved in MAM other than database ? or what should I check ? this issue is intermittent and my team not yet can reproduce it.

Thanks guys, hope anyone can help.

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