Reseat the cabling to the cache drive (power and sata). It dropped offline in the those diagnostics.
The can't create /boot/logs implies that either you pulled the flash drive out or it also dropped offline. Reseat it (if it's a continuing problem, try a different port, ideally USB2)
Either one of these will cause the issues you're seeing.
Ultimately your only recourse is a power down. Try at the terminal
powerdown
To see if it can gracefully shut itself off. Otherwise do a hard shutdown.