This is usually caused by a loose or unstable USB connection under the seat.

Check the USB-C Connection 
Look under the seat cushion to find the USB-C cable. It may have come loose or disconnected due to the chair's movement. Unplug the USB-C cable and then plug it back in firmly—ensure it is pushed all the way into the port. Once reconnected, test the buttons again to see if the functions have restored.

Further Assistance 
If the functions still don't respond after reinserting the cable, there may be an issue with the port or internal wiring. Please record a short video showing the USB-C cable being plugged in, the status of the port, and you pressing the buttons. Send this to our support team so our technicians can troubleshoot the issue for you.