I have the issue again so I tried to uninstall/reinstall the "n900-fmrx-enabler" package. After a few uses of FM Radio Player, the issue comes back.

My "n900-fmrx-enabler" current version is "1.5-4+0m5". Is it the last version ?

To fix the issue, I must make the procedure I described in my third post (reboot, remove configurations from FM Radio Player and reboot again). But, it just give me between 1 and 5 times I can load and exit the application before the problem comes again.

@uhbhatti88 : I am sorry, I don't know "OTA". This is an acronym ? For what application ?