The transmission is unstable / the FO signal changes a lot

Check the Dynamic dither settings via the menu bar > PARAMETER > Stabilize or by pressing Ctrl + F8. The FO dither threshold should be at ~70% of the maximum FO signal which is constantly shown on the left side of the main window. Also a too high FO Dither max value or a too small FO Dither min value might cause issues. A good maximum value is 0.01 – 0.02, good minimum values are 0.004 – 0.002.