ReadyNAS 2120 Crashing Regularly v6.50

We implemented a ReadyNAS 2120 v2 a short while ago and have been experiencing numerous issues with the system crashing.  The device is being used purely for NFS communication to VMware as a Veeam backup target.  Upon initial installation, the device would crash after two days of use.  After checking the support website, we discovered that there was a firmware update which was supposed to improve this.  We installed the firmware update which resulted in the device being more stable but it would still crash after 1 week of use instead of two days.  An additional firmware 6.5 was released and we installed this hoping that the situation would be further rectified but this has made no difference - the device still crashes after 1 week of use.

We have disabled all additional services on the device to leave just NFS, HTTP and HTTPS capabilities enabled.  We have also tried to configure the device to perform an automatic reboot of the system during a quiet period once a week as a workaround but the device would power down and not automatically power back up again.  The device is using a single network connection after reducing this down from dual connection after our initial issue.  The user viewable logs are next to useless as they only record the reboots that occur and nothing is logged on the lead up to the crashes.

Any assistance or further suggestions would be appreciated with this.

Thanks

Chris