I believe this happened after a power outage , can you login in your local Router copy and paste these ips in the URL 192.168.1.254 or 192.168.0.254
That would be redirect you on your local Router ATT and check the device list on the Router.
There should be a device that is called Switch-Router ICX-7150 or something like that.
Could you please confirm this in order to confirm that the switch was not misconfigured
Also you can shared a screenshot here to help you.