Was playing last night and was headed east to do a side quest from the botanical garden when all of a sudden the voices and audio went extremely distorted and robotic.
I died and when I reloaded an autosave and approached the same area again, the issue repeated.
Edit: this morning, after a reboot, the issue in the area seemed to be resolved, however there's definitely something hinky going on there.
PS4 slim, standard HDMI output for video/audio