I do not recognise the make and model of your recorder.
You could try the same fix as with the Humax 9150T which can suffer from the same symptoms.
Here are some instructions for the another Humax http://hummy.tv/forum/threads/hdr-fox-t2-tuning-advice.472/page-2#post-5824
NS
August 2012
hi linda you have to switch your box of unplug it let it cool down then put back on if you have recorde you will need to delet some
annie
November 2011
You really can't expect someone to answer this question when you don't even say what the box is, can you?
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Try fixfault.com to fix dtt receivers.