Openfire 3.5.2 + Spark 2.5.8 : disconnections due to compression exceptions


We are evaluating OpenFire + Spark with only 7 people connected .

It happens quite often (a couple times a week) that people get disconnected due to ZLib thrown exceptions (logs extract attached).

Edit : after browsing JIRA, I can see this is a long time reported problem. Sorry for the duplicate report.