My Server Stops Automatically

Hello,

While I'm playing with my friend on my server, sometimes we are kicked from the server and then it stops. And there are times I'm in the queue waiting for my server starts, but when it's starting, suddenly it goes offline for no reason. My server log: https://mclo.gs/OEYBkAj.

In some days, the server is also a bit laggy.

I think it's visible now: https://mclo.gs/5UekS4j

Can someone help me please?

Is this a big problem?

Can anyone talk to me pls?

So, what's the problem of my server?

Well, I've been waiting for 1 month for an explanation, but seems it will take a little longer.

My log exists for me... but I can write it again: https://mclo.gs/5UekS4j

I didn't do anything. But if I install spigot and clearlag, will the mod I'm using be deleted?

The switching to spigot and install clearlag thing I'm understanding, but I use a mod in the server.

So, it's wrong. I really use a mod.