Server is stuttering slightly for some reason?

Hi, my server is having issues with small stuttering /  lag and i'm not sure how to fix it, it averages out at 45 - 65 players and it usually is never laggy, but within the past 24 - 36 hours i've failed, here are my plugins and the only other server parameter i have is minicopter.population 1, for anyone who wants to have a look at my plugins here you go.

https://prnt.sc/1104wv1

https://prnt.sc/1104xak

I have a feeling its to do with my host, but i've contacted them numerous times and I have had the same response that "Nothing is wrong" 

Could anyone please point me in the right direction? Thank you.

I am willing to pay whoever can help me with this QUICKLY £10 VIA PayPal, thanks.

This can happen near the end of the wipe when the entities have increased to a level where it affects server performance

I used to save and restart my server every 48 hrs. With the introduction of the train system, I have found the memory cache climbing slowly over the day (memory leak?). I have now set my server to auto save and restart at 6a.m. has fixed the issues. You may have to manually reload some of your discord plugins though. Hope this helps.