I am tuning my Android tv satellite channels on a manual setup:

11591Hz 5 Degree W. This picks up the channels I want (French national channels: France 2, France 3, France 5, France O, LCP).

This works as expected. After a few days, all the tunning disappear, and the only way to get the channels back is to redo the tunning which takes a long time to do (setup 1,2,3 steps....

The TV is a KDL 43W809C receiving from the UK.

Does anyone know why, and if there is a resolution?

Many thanks