I had the three "old" LG tuners in my VU + Ultimo enormous problems, so that it always came to blackouts and artifacts. Probably the LG tuner have a low control range: The signal strength in the cable network is frequency dependent. If so determine controls are weak, there is picture interference. Now, if raising the gain, then the tuner override again at other stations. In addition, you often the tuner in series, which further complicates the situation.
So I have the seller of my VU + convinced to take the originally installed LG tuner back and looked at the new DVB-C / T / T2 Tuner (Samsung) purchased and installed. Since I have all three tuners perfect reception of all stations. I would have saved me the hours of troubleshooting, if I had known that it is up to the tuner!
If possible therefore immediately be installed this tuner type or replace the original tuner company LG!