OS6 now works on x86 Legacy WARNING: NO NTGR SUPPORT!

Okay folks here's a new one:

About and hour ago I rebooted a ReadyNAS Ultra 4 with four 1TB drives. I did this about 30 minutes after deleting a share from the GUI that had about 80% of the data volume's files in it. I rebooted because the pie charts and graphs in the GUI were not reflecting any change of available free space. After the reboot, the GUI did reflect quite a bit more free space in the data volume, but now every 10 minutes I'm getting sent an E-Mail that says:

System volume 'root' usage is 91 %. This condition should not occur in normal conditions. Please contact technical support.

System volume 'root' usage is 100 %. This condition should not occur in normal conditions. Please contact technical support.

System volume 'root' usage is 99 %. This condition should not occur in normal conditions. Please contact technical support.

System volume 'root' usage is 99 %. This condition should not occur in normal conditions. Please contact technical support.

Etc., etc., etc. over and over.

From the command line I ran:

df

which resulted in

Filesystem      1K-blocks      Used  Available Use% Mounted on
rootfs            4192192   3505532      48140  99% /
tmpfs               10240         4      10236   1% /dev
/dev/md0          4192192   3505532      48140  99% /
tmpfs             2021468         0    2021468   0% /dev/shm
tmpfs             2021468      4544    2016924   1% /run
tmpfs             2021468         0    2021468   0% /sys/fs/cgroup
tmpfs             2021468         0    2021468   0% /media
/dev/md127     2915731968 866720844 1933903372  31% /data
/dev/md127     2915731968 866720844 1933903372  31% /home
/dev/md127     2915731968 866720844 1933903372  31% /apps

Help! I have no clue how to troubleshoot this one.
Thanks in advance!