I started with one disk ST3000DM001, and the NAS restared several times. (Same behavior than yesterday)
I tried with other HDD of 1TB (Seagate ST31000520AS CC38), and I got the same result, the NAS restarts when it is working with the disk (formatting, checking, etc).
When it is idle, the NAS doesn't have any problem. I'm really disapointed because I invested a lot of time to make work this QNAP NAS and I don't know what to do.
By the way, wheh I checked the registry, it said: "[Single Disk Volume: Drive 1] The file system is not clean. It is suggested that you run "check disk".", and when I check disk everything it's OK, in did, when I conect trough the shell, I can read that the system file is celan ¿?.