If the headset has been turned off or in sleep mode, the controller may no longer be connected. When the headset enters deep sleep, the controller automatically powers off. This happens one minute after you take off the headset. After that, you’ll need to reconnect the controller. How do you do that again?
Turn on the VR headset by holding the power button briefly until the PICO logo appears.
Put on the headset and look straight ahead.
Hold the controller horizontally in front of you.
Press and hold the HOME button for more than 1 second. This is the bottom button on the front of the controller — the one with the circle icon. The controller should now be connected again. 🎉 If it still isn’t working, have you tried replacing the batteries? See: 🔋 The controller’s battery is empty