@rajm
Do a consistency check of the database:
https://wiki.strawberrymusicplayer.org/wiki/Database_integrity_check
Try re-creating the songs_fts data, with the following commands:
Remove all songs_fts data:
delete from songs_fts;
Re-create songs_fts data from songs:
INSERT INTO songs_fts (ROWID, ftstitle, ftsalbum, ftsartist, ftsalbumartist, ftscomposer, ftsperformer, ftsgrouping, ftsgenre, ftscomment) SELECT ROWID, title, album, artist, albumartist, composer, performer, grouping, genre, comment FROM songs;