My Server keeps shutting down by itself

Hi, my server keeps shutting down by itself (not a crash) and nothing in the log
It's like someone keeps shutting it
All that i can say is it might be because of the server's storage it might be up to 400Mb (When the server is online)
And when the server is offline it's just like 200Mb
I used to have bigger servers with more plugins/builds/maps/worlds and even online time
Idk how to fix that if someone can help i would be glad because my friends/players keep asking about the reason
And i don't have any solution for the problem

That's weird i didn't know it's because of memory, how to fix this tho?

https://mclo.gs/K0TDap9