What version of the OS (firmware) is installed on your Genos?
The latest version is 1.30, and amongst the many 'bug fixes' that Yamaha actually admit to
in this version are:
-Improved the operability when showing lyrics of the "MP3+G" type on the Lyrics display.
-Fixed a problem in which certain MP3 files would not playback properly.
So if your Genos has firmware version 1.20 or lower, your problem might be fixed by installing the latest version (1.30).
You can check what firmware version is currently installed by pressing/touching...
[MENU] > [Utility] > [System]. The firmware version is supposed to be shown at the top of the display.
If the currently installed version is not 1.30, you can download this version from the following link...
https://uk.yamaha.com/en/support/updates/firm_genos.htmlRegards
Ian