Start problem, only runs at the second start

Hello together, I have been recently owner of a nice 2008 Phaeton. And I already have a small problem and it only runs on the second start, i.e. the first start he dies directly off and when I start the ignition and start it renews it runs. Of course, due to the breakdown of the voltage various undervoltage errors are present. I have already replaced the batteries with original batteries according to the instruction, because I had the assumption that the starter battery at the s tarten collapses. But this didn’t help, so I just swapped the two relays for on-board grid and start, i.e. opener swapped for clasp and see it starts wonderfully the first time. Now I would need a schematic to check what exactly I am bridged here or maybe someone already had the same problem. I’m looking forward to your answers LG Ruhl