It only turns off very briefly when I stop watching a channel and than right back on again
I use VDR/VNSI. It constantly scans transponders for EPG, so the LED is always on. It should turn off when there is no signal. Also, there is a short blink when switching from one frequency to another.
Does it turn off then there is no signal from antenna?
The tuner is also constantly warm
That's normal. Same with 5520SE.