Been using the EX2 as a network storage space for a couple of months now and it has been great. For some reason I am now getting the not enough space on hard drive when I try put files there and I have 1.21 TB free and I have no clue as to what is going on. I know it did a frameware update on the 9th but other then that nothing has changed.
Have you tried resetting the unit? If not, press and hold the reset button for 4 seconds.