Can you obtain the Areca logs and send them to the support ticket 1009172 and send them to Areca for verification. Also we see a very high load from the CPU and engineers think it could be something with the RAID, recommend to do a RAID verify.

Also check to see if there is a another IP Address that is using the same address as the DSS 172.16.0.1 (Printer, PC... or other).