battlefield Hardline keeps redownloading

I recently bought battlefield hardline for my ps4, i downloaded it from psn waited through my horrible download speed and then a slow install to play the game. i eventually got to play and tried the campagin and mutliplayer. then switched to a different game and played that but when i came back to play hardline it was gone and apparently had been deleted. i just wanted to know if this was a problem with others or if somethingd wrong with my ps4 

p.s. did not purposly delete or try it was just gone