I'm not sure if anyone else has experienced this issue, but I cannot find any information about it.
I have a few dgs-1500-28p switches that will (what seems like at random intervals, or if they lose power briefly) reset back to their default IP only. The password that was assigned, name,...etc etc all remains, but the default IP address reverts to 10.90.90.90.
I make the changes both via CLI and web gui (And yes I save the configuration every time), but this has been an interesting issue and I cannot find a resolution.