Unraid won't properly shut down after upgrade

[Southweave]

Hello, I just recently acquired a new motherboard and CPU for my unraid setup and after upgrading unraid won't shut off. 
Whether I use power off function or the sleep plugin neither gets past "umount: /boot unmounted" text at shutoff. 

Hardware: 
Processor: Intel I7 8700k
Motherboard: Asrock Z370 Fatal1ty Gaming K6
Graphics: AMD HD7970
Memory: 16GB DDR4 3000MHz
Storage: Single SSD 
                Four HDD's

Previous hardware: 
Processor: AMD Ryzen 1600
Motherboard: Gigabyte AB350M Gaming 3

The issue is on both versions 6.4.0 and 6.4.1. Basically currently I am unable to shut off the unraid without having to smother it at the end. 

The unraid is booted on the IGPU and does not use the GPU (If that matters)

The diagnostics are taken after booting up again so I am not sure if it holds any valuable information. 
It was stuck in that particular screen for over 4 hours (at night) so it won't shut itself off eventually...

I will try to respond as fast as possible with any information requested. I currently do not know what else to add. 

Thank you for your time. 

server-diagnostics-20180208-0823.zip

[Southweave]

Update 1: 
I did some testing and I found that if I start unraid on GPU then the system shuts down properly. 
Is it a known problem or is there a way to fix it? I'd like to have VM and unraid terminal open at the same time.