What is the weather like round your way? Could be heavy rain temporarily causing interference or strong winds have caused the dish to move out of alignment.
It would be nice for the Humax to emit a sound when it locks onto the satellite as you move the dish.
They could make it easier…..
The very cheap sat meters already do this, you use this at the dish. They can only give you a basic lock. You need to fine tune using the quality display on the box.
I suffered a similar problem two weeks ago after carrying out a ‘Freesat Tune’. Have a look at the other thread, “Unable to carry out ‘Freesat Tune'”. The advice that grahamlthompson gave me was very useful and sorted out my problem.