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Over several patches I have experienced this phenomenom. Usually in high elven choke point maps and today in an ogre camp battle.
Usually the battle goes without issues but eventually it starts an intermitent "pause/freeze" of time. Repeatedly increasing in severity until eventually it is freezed completely. Pause button, ESC, control wont work but the sound still goes on. I attached a video example. Note that only the visual and interactable part of the game freezes but never the sound.