Barry can you recreate?
Humax 1.00.15 & 1.00.17.
Scenario as follows:
Network set to DHCP. Box in standby, 5 minutes prior to recording start with clock being displayed in LCD.
Power off at rear switch. Wait 30 secs. Power back on. BOOT displayed then reverts back to the clock.
Power on via remote to active channel then Open Menu/Settings/Network. All fields zero. A change to manual restored the network.
Repeat test with Network set to Manual and got the same result although settings fields were populated. Change to DHCP and working again.