I have a 2011 Ocatvia 1.8TSI L&K and I have somewhat similar problem with the car! When I turn the ignition ON after 24h+ when the weather is under 10c I can hear a "ding" and a spanner symbol is flashing on the top right of the screen. If I see this then I know the car won't start. If I leave the ignition on and I wait 10-20 seconds until my dashcam boots up and starts then I turn off the ignition, turn it on again and most likely the car will start without any problem! My first thought was the battery but I replaced it with a brand new one, but the problem still persist. But what is more interesting, if I don't try to turn on the ignition after I opened the car, and I connect my NOCO Boost GBX45 jump starter to the battery terminals, the car always starts immediately without any issue! If the weather is good and the temperature is over 15c this problem never happens and I never hear the "ding" sound and the spanner is not flashing on the screen and the car always starts to the first try! I hope someone can help us to find the root of this problem because it is very annoying!