My Mikrotik routers and switches also reboot in seconds (even for upgrades), which I’ve never seen consumer gear do!
Even my Ubiquiti switches seem to take a minute or so to start forwarding traffic after a reboot; whilst my Mikrotik switches reboot faster than any of my unmanaged switches start up.
When it happens, try pressing
Alt
+SysRq
(/PrtSc
) +o
. If that turns off your computer, then the kernel is still running and something is preventing shutdown; if it doesn’t, either SysRq is disabled, or ACPI is broken.