It does appear that you are trying to set eth1 to static ip address but it is not updating. Please try using different browser and computer in setting up the ip address from the admin page. You may also try to disconnecting first eth 0 then change the setting of eth 1. Please check if you can change other setting on the NAS, like if you could enable or disable services. There is a possibility that OS partition is filling up, that is the reason why any changes made are not updating.
It does appear the OS partition is in a good condition. Changing the ip address from the config file will require backend access to the NAS if you are well versed with linux I believe that will work. I would recommend to perform an OS re-install, part of the process will reset the network setting of the NAS.
Upon properly performing OS re-install the NAS NIC card should go back to DHCP. Just to confirm other NIC card went back to DHCP except eth 0 is that correct?
There is a possibility we are encountering a software or hardware problem. For isolation we can try to reflash or upgrade the firmware of the NAS to beta version and check if that will make a difference. Do you have a backup of the data save on the NAS? We also have an option to perform a factory reset on the NAS and then reconfigure the it from scratch and transfer back the data to the NAS but we need to make we have a backup of the data.
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