Hi...I use Apple 11 pro max and have some downloaded music from across the years, a few weeks ago I noticed 2 songs glitching away and was seriously upset...someone here posted clear cache, tried it with no success...make available offline option being on or off, makes no difference...I'm not very tech savvy so the thought of deleting and re-downloading dropbox, gives me a fright...so ummmm help required, please!