I get this problem which is very annoying.
I use a hard-wired ethernet cable to connect to my network.
To get my SC200 to work again I do this:
Turn off power on the front panel
Disconnect Ethernet cable
Physically disconnect the power cable to the SC200. Wait 10 secs
Plug power chord back in
Attach ethernet cable
Switch on front panel power.
To me it's as if the IP address is not being refreshed properly with my router.