When I start the game, everything runs normally, but after a while I start getting severe audio delay, missing animations (opening doors, fast-travel, etc), the zone and world maps take a several seconds to load and only the icons appear immediately, and interacting with NPCs either doesn't work or takes longer.

I've not only reinstalled the game, but also the PS4 twice because I thought it was some sort of data corruption. Yet these issues always return.