Samsung galaxy s6 deleted music

[Lee Siddall]

Advice !!!!
My galaxy s6 keeps for some reason deleting my music or deleting summat as everytime i down load some music it play fine and a hr or so later says sorry this player doesn't support this file when i know it does as been listening to them allday please some help

 

[B. Diddy]

Welcome to Android Central! From where are you downloading these music files? Is it a legitimate site, or a "free mp3 download" site (which is likely of questionable legality, and potentially risky in terms of malware as well)?