the same problem occurred with my first version of the 320L.
the trader replaced this device, and i got the hardware revision A2.
don't know exactly if the first on got revision A1 or A2.
now the problem occurs again since yesterday.
every time i want to copy file to the nas, i got some message like "network path not found".
i started to ping the device, but there is no errors or interupts, even if this error message occurs.