Sound cutting out randomly.

I'm having an issue where dialogue is cutting out randomly throughout each episode. I downloaded the most recent patch and that seems to have fixed some of the skipping and other audio issues in episodes 1 and 2, though when I replayed the game yesterday I noticed a line of dialogue from Ramsay was missing when I've never had a problem with that scene before. My main problem is with episodes 3 and 4, where entire conversations are missing sound. It seems to be random, because if I rewind or replay the episodes, there's maybe a 5% chance the sound will be intact. A few examples:

Episode 3

• the conversation between Cotter and Gared is mostly missing, when it was intact on prior replays.
• the confrontation between Rodrik and Gryff has no background music, and now some of the dialogue is cut out when it was there before.
• Asher's final scenes at Dany's encampment have missing dialogue, most notably Dany's end line.

Episode 4

• all of the Asher scenes have missing sound.
• Mira's scene at the Lannister party has randomly missing dialogue.
• the dialogue during Lord Whitehill's dinner party is mostly missing.

I can still hear background sounds, like the sound of boots in the snow or Rodrik's cane hitting the ground, during these scenes. I cleared the system cache before playing yesterday and it didn't help.