Yes, you are right. All ESXi Hosts in trouble have the following configuration
ESXi 1 - vmk0: vMotion / vmk1: Mgt
ESXi 2 - vmk1: vMotion / vmk2: Mgt
ESXi 3 - vmk0: vMotion / vmk1: Mgt
I have no idea how to change vmk(x) and don't understand why there is no vmk0 for ESXi 2.
Your advice is sought.