Seafile server 6.2.3 suddenly "stops"

Hey. I have configured Seafile Server 6.2.3 on Centos 7 with memcached, Nginx and mariadb.
Usually it runs smoothly and well, but sometimes it just turns itself off.
ccnet log:
https://pastebin.com/6L9zzG1c
seahub_django_req.log:
https://pastebin.com/eDnBzdBQ
seahub.log:
https://pastebin.com/N1uZBLWH
seahub settings:
https://pastebin.com/UVQ5BkPk

This is driving me crazy. Any help would be appreciated and if im missing some logs i can provide them.

What Server Backend do you use? Does your system have enough RAM/SWAP?
This can happen if there is an IOPS caps e.g. which causes services to stop.