My twiddler seems to be suddenly fully unresponsive. Clicking the joystick button does not trigger anything; if I plug it into a USB port, when it's turned on, the light is red, but it still will not send input to the computer. If I switch it off, even if it's plugged in, the light goes off.
This seems not to be the expected behaviour:
Orange - Charging in progress; power switch ON; plugged into USB power.
Red - Charging n progress; power switch OFF; plugged into USB power.