The only problem I have with NTL bb is that the box locks up from time to time.
This is an RFI problem that I have taken up with the box manufacturers. Being a radio amateur i'm used to this type of problem - I can cause it if I transmit too much power.
It is worth resetting the box every now and then. Turn it off then unplug it for twenty seconds. Plug it back into the mains BUT DO NOT turn the box on 'til you see two non-flashing green leds on the display.
The above also helps when you have a local cber using illegal power or dirty mains.