The program works perfect, I have Windows 11, and for some reason when I stop using my computer for several hours (I never turn it off) it goes into suspension, when resuming Windows the program stops working and I have to change the audio output again
The issue with sleep mode is well-known and has been posted several times on the forum.
A recent update attempted to address the problem, so can I first ask you which version of FxSound you are running?
You can find the version number in the Settings menu, under Help.
The latest version released is 18.104.22.168, available for download on fxsound.com.