I am also experiencing this issue. Brand new hardware (assembled), firmware 2.0.4. The unit will, at apparently random intervals – usually less than 12 hours, sometimes less than an hour – freeze. The only sign of life is the orange LED on the ethernet port, which is flickering. The green LED on the ethernet port is on solidly. The display is frozen at the last time prior to the freeze. The unit is utterly unresponsive otherwise. I will try the suggestions above and report.
[EDIT] DHCP has always been static, but NTP has been on, and Auto Reconnect has been on. Also – the unit is connected via ethernet to a DSL router/modem. The internet connection is dodgy at best – and slow.