Yeah, this thread needs to close. I've been going out of my mind trying to figure out the shutdown = reboot and sleep = impossible problem with my Gigabyte Z370M D3H. I've ordered the SYBA SY-PEX3009 and have my fingers crossed. Also, if it's as rock solid as this thread suggests, I think it'd be *really* really good to look at getting it put on the hardware recommendation list.
I know, I know... 'it's 2018!' & 'why would anyone want firewire today?', but the petty hill I'm willing to die on is that I adore my Focusrite Saffire Pro 40 audio interface and I use it pretty much all day, every day. If it died I'd buy another in one hot heartbeat.