Is anyone finding that there are sigificant problems with the DX80 voice mail (flash and hard drive) that are causing continuous problems and need replacement?

Our most recent issue is a new hard drive voice mail for a DX80 that stops. The customer then reboots the system. Works fine for a few days then happens again. By the way, it is a 4 port voice mail.

Any ideas what tio troubleshoot?
Thank you