I have had my Foxsat for a few years and recently I am experiencing the same problem.
Typical is this morning when I was recording a programme. I found I was unable to tune in to any other channels getting a no signal message. After the recording had ended I went in to the menu “Diagnosis” and saw that my second lnb input was showing nothing which explained the problem.
Anyway, I switched off the box, waited and then switched it back on again. When the reboot had taken place both inputs were now back.
Now for my questions! Does this indicate a fault at the box or is rebooting doing something at the LNB to switch the second input back on somehow?