Random local files greyed out on android app

[florriee]

Plan

Premium

Country

United Kingdom

Device

Samsung Galaxy A3 (2016)

Operating System

Android 7.0

My Question or Issue

Recently I added about 50 new local files to my main spotify playlist (as well as a few others), on top of the 100 or so I already had. On desktop, this works exactly as it should, but on android some songs just randomly become unavailable for no reason that I can find. To fix it I have to remove the song from any playlist where it's downloaded, then add it back via desktop. The next day, however, a few more songs will become unavailable. It used to just be local files that I had in multiple playlists, but I had to redownload all my songs and now it seems to just be random. Anyone got any advice?