As the message are related to Kernel, and the interface was up and down, then we recommend you to check the network devices that attached to your NIC cards, such as cables, switch, router, etc.
Also to update your DSS build to the latest, as that will give you the latest drivers for your NIC cards, and as "disabling it" note, please check if someone tried to disable the connection, or if the connection stopped manually.
Okay we finally resolved the problem. Our NIC had a problem (couldn't figure out what exactly the problem was), we exchanged it and now it works as expected. Thanks!