During Cup of the Day, when opening settings, there's a chance the game freezes for a few seconds at the start of the next round.
Usually this happens to me once every COTD (because the game sometimes changes itself into windowed borderless from fullscreen, or to switch audio device), and this freeze would last up to 10 seconds for me.
For example in this video, I opened settings during the previous round, causing the freeze at the start of the round for around 3 seconds: https://streamable.com/5x5wy3: (https://streamable.com/5x5wy3)