... and suddenly, bluetooth stopped working: No default controller available

I have looked at previous similar questions, but still I can't make it work.

I have tried with the previous kernel (which I didn't upgrade recently btw).

In my Intel NUC8 bios the bluetooth is enabled.

But if I try to connect to my bluetooth speaker I only see this:

➜  ~ bluetoothctl
[bluetooth]# connect 00:22:37:54:51:53
No default controller available

I am not sure this could help, but I have noticed that this command

➜  ~ dmesg | grep -i bluetooth
[    3.801286] Bluetooth: Core ver 2.22
[    3.801773] Bluetooth: HCI device and connection manager initialized
[    3.801777] Bluetooth: HCI socket layer initialized
[    3.801779] Bluetooth: L2CAP socket layer initialized
[    3.801784] Bluetooth: SCO socket layer initialized
[    4.500700] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
[    4.500702] Bluetooth: BNEP filters: protocol multicast
[    4.500705] Bluetooth: BNEP socket layer initialized
[    5.858216] Bluetooth: hci0: command 0xfc05 tx timeout
[    5.858217] Bluetooth: hci0: Reading Intel version information failed (-110)

returns a Reading Intel version information failed (-110)

Any idea?

I also resolved this by powering down my laptop, as mentioned by the question's author in a comment.

Simply restarting did not resolve the issue. To be completely paranoid, I also unplugged the machine from the power supply before powering it back on. Bluetooth magically re-appeared.