Is that empeg in standby? If so, might be a wiring problem.

Exactly. After the empeg goes completely off (see here for a description of the difference between "standby" and "off"), nothing but a power surge to the ignition wire should be able to wake it up again. Not even stray IR.

If your empeg does not go into standby and then into full power off mode when you turn off your car's ignition, fix the wiring until it does.