alpine cda-9812rb question!

Hi together, have a new radio – the alpine cda-9812rb. I have a question to ask. and that is: maybe you know what this could be about, that the radio does not concern automatically, if I start the ignition or start the motor. I always have to press the “start” button first. I have already looked in the manual, but there is also nothing. cable I actually connected all in the back correctly. or yet not…?! oh yes, if important, I drive 2002er twingo.