The nod has mixed architecture of VM's, a windows vm, a bunch of Ubuntus, Red Hats, and CentOS. I've noticed that I'm running 4.15.17-1 kernel on my other nod so I tried to downgrade the kernel to 4.15.17-1 and I'm watching it now, it looks better still no drop. I'll post an update after some time. Thanks for the suggestion Markus! Update: After reverting to kernel 4.15.17-1, the problem disappeared.