Guide button not working

The Steam button doesn't seem to be working. It seems to only turn on when I press any button while it's on the puck. When I hold the button for 5+ seconds, the controller remains on. When I try and press it with the Y button, nothing happens. Steam+R1+B does not place the controller into BT mode.

The only way the controller will turn off is by letting it idle for 5 minutes. Any ideas on what I can check?