Check engineering software updates here..
http://www.dtg.org.uk/retailer/index.html
Each month, for each Manufacturer & for a limited period, Freeview updates it's software to improve service or remove software bugs. Some early boxes locked up on channel change through radio channels or on poor signal.
Don't know Goodmans box but worth checking your box is up to date on software before writing the box off.
Goodmans is usually a re-badge of another brand, you may need to check with the superstore you purchased the box off for the true origin of box manufacture.
Cobweb
November 2004