It was working fine for almost an year before the upgrade to 9.10.2U1.
Additionally removed all the "autotune" settings and disabled the autotune, and it stopped freezing from the time being.
This is a HomeLab, not sure if it really need more than 8GB, has been working like this for more than an year.
Also had used in the past with 4GB and had enough juice for iSCSI and NFS to a Home lab.