Vespa GTS 125 “ABS disconnected”

Hi, my Vespa 125 GTS (MY 2020) makes bitches. Starter spins 3-4 times and on the display is in red “ABS disconnected. Service” to read. But it does not start, display flickers, then radio silence. Battery is OK, just recharged again. Cables are fixed. It has just service and TÜV behind it, about 5000 km on the clock and ran so far completely reliable. Before I now organize a transport (dealer 30 km away): is vlt any cable or plug loose, which I myself can stuff together ?