Openfire Weekly Crashes - trying to find out why

Hello.

I inherited an openfire installation that was set up years ago and never looked after too much. Everything runs well for the most part but on average 1x every 10 days the service will crash overnight and require logging in and starting the service to get it working. This morning it crashed at 2018.03.01 06:55:20 but I’m having trouble finding any trace of a reason.

Any tips on where to go next? Thank you in advance.

Check the logs at /openfire/logs/all.log