FreeNAS fails to boot on a 8TB os drive afer a few reboots

Installed FreeNAS 11.3U4.1 and 11.3U5 on two servers with the same hardware configurations:

        Manufacturer: Supermicro
        Product Name: SSG-6028R-E1CR12H
        Memory: 32 GB RAM

        Storage: 12 x 8TB SAS drives (including OS drive).

After rebooting the servers 3 - 5 times we get the following boot error:

Shortening read at 4284867280 from 16 to 15
ZFS: i/o error - all block copies unavailable
ZFS: can't read MOS of pool freenas-boot
gptzfsboot: failed to mount default pool freenas-boot

FreeBSD/x86 boot
ZFS: i/o error - all block copies unavailable
ZFS: can't find dataset 0
Detault: freenas-boot/<0x0>:
boot:

This happens on both BIOS and UEFI installations.