Can't Select All Tracks in "My Music"

[hybridhighway]

For playlists, select all works fine. I can select all tracks, or I can use the Shift+select feature to select a batch of tracks at once. But in "Your Music", it ALWAYS leaves various tracks unselected inbetween. Having a collection of over 5000 songs, this is an absoloute nightmare and dealbreaker. This problem has persisted since I joined; the late 2014 version of Spotify. Also occurs on both on Mac and Windows. Please fix this ASAP, I don't understand why this happens at all.