I was in a game earlier with all of my teammates and the opposing teams walking in a straight line and not moving the whole game and as soon as I won three rounds it auto surrendered for no reason. Does anyone have an idea of what this is?

Here's some context: I've been a Gold/Platinum ranking player for a while, ever since I got to play Valorant. Just after one day of bad games, I manage to get demoted hard to Silver 3. Let me tell you, grinding out of **Silver 3 is hell.*...