Brand new Multiplus 12/3000 120 230V connected to a brand new Cerbo keeps restarting after a few seconds when connected with a normal UTP cable. Not cross over cable, tried a several cables with the same result, not pluged in to LAN port but to ve.bus, tried powering the Cerbo from the same source battery as Multiplus even a different one - didn't help. If I leave the cable connection, Multiplus keeps restarting. It works for some 3 seconds and resets. Then it works again for some 3 sec and it repeates again over and over. For the approximately 3 sec I can even see on the to cerbo connected display the usual menu with current movement in system. So the connection actually works. But just the approximately 3 seconds. When I disconnect the utp cable, the Multiplus works without any problems. If I stop the Multiplus ("Off" mode) on the Cerbos display, the reset won't happen even if plugged to Cerbo. It happens just in "On" or "Just charger" mode.
What is the matter please????