DTT - Goodmans GDB 3 problems

I got the Goodmans GDB 3 DTT receiver last year, and in the last week there have been a few problems. To start with,I have a strong analogue signal so do not really notice a difference with DTT. On the EPG information when you press the i button, on a few channels including Channel 4, it said nothing beside Now and Next and give the times as 01:00 - 01:00 for both of them. On five one day, the picture froze completely and the sound disappeared. On a few occasions the picture has broken up with bits frozen but the audio continued fine. There are alot of dropouts in sound, with the sound disappearing for about a second. On analogue there are no problems. Although I live Digital because of the interactive features and better quality on some channels, it is too unreliable to watch. I sometimes watch programmes on analogue, even though I have a digital receiver because there aren't any problems. If there is only digital television in the future this is what we will have to watch. If any of you use SkyDigital can you tell me if this happens on SkyDigital as well? Also, I have a television in another room which is analogue only and uses a separate aerial and if it is on and the Digital receiver is on on the same channel, there is a delay of about 3 seconds on the digital transmission. Is this a feature of DTT or is it something to do witth my receiver?
I would prefer to watch analogue as it does not have problems like this.
If any of you have similar problems, could you tell me what they are?

Try here.