You have installed network manager:
ii network-manager 1.6.2-3 armhf network management framework (daemon and userspace tools)
ii network-manager-openvpn 1.2.8-2 armhf network management framework (OpenVPN plugin core)
ii network-manager-openvpn-gnome 1.2.8-2 armhf network management framework (OpenVPN plugin GNOME GUI)
Network manager conflicts with connman and should not be installed on OSMC. It’s possible that the crashes are down to a serious incompatibility with the new version of connman .