Yes the system is perfectly stable, despite the reboot issue.
It might have something to specific to do with Corsair memory.
You can also try put XMP on, and set the frequency of the memory lower.
That fixed the issue for me, when putting the memory in 2666mhz instead of 3200mhz.
But I want to use the full performance of the memory I bought. So that's only a workaround for now.
Still it's possible to downgrade to F4 (that's what I did) then it works fine with XMP enabled @ 3200mhz.
But you need to use a FPT with a bootable USB, edit the bios file with a hex editor, so your MAC adress isn't lost.
And reflash again from inside the bios menu with an unedited bios file.
Even if your MAC adress gets lost, the network card will still work. But I would prefer to keep the MAC adress.
As I said before, I described in this thread how you downgrade to F4.
It's actually quite easy.
And if you brick the bios, which would only happen if the power gets disrupted, or your system crashes during the flash.
You still have a backup bios which should kick in next time you reboot.