Download center make my NAS unavailable.

Previously I find that the NAS will down if the default folder contains blank space. I changed the name of default folder and it work again.
And it down again Today, when I put a torrent file to the monitoring folder. It may caused by too large or many file in the torrent. I will need to reboot the server Tonight when I back to the NAS location.
By the way, even some settings are not compatible to the download center. It should not down the NAS easily. Now my NAS is totally unavailable, for all of the service, including the ADM and public web site.
I am using AS-302T.
And it down again Today, when I put a torrent file to the monitoring folder. It may caused by too large or many file in the torrent. I will need to reboot the server Tonight when I back to the NAS location.
By the way, even some settings are not compatible to the download center. It should not down the NAS easily. Now my NAS is totally unavailable, for all of the service, including the ADM and public web site.
I am using AS-302T.