In early DB7000 models, power supply repair (with capacitor replacement) improved stability at low symbolrate channels. DN5620 has the same tuner. There is the possibility of the same problem. This tuner is a lot of better in other receivers (I have read it somewere).
A have almost the same problem with 5620 and Gemini 2.7.
It locks the channel, but the picture and audio quality is very poor.
With Gemini 2.1 I have no problem. Try other image.
I do not now what causes it.
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