Severe frame drops and stuttering caused by keyboard input

 I mainly play Battlefield 1 and recently noticed frequent frame drops. After multiple tests, I found that pressing the A or D key on the keyboard causes the frame rate to drop sharply to 30. However, the problem disappears when holding down the ALT key. Currently, it is suspected to be an issue with EA's anti-cheat. The game is unplayable due to the stuttering. I have seen players of Battlefield 1, 5, and 6 reporting the same stuttering, affecting the entire Battlefield series. Some players who just bought the game even requested refunds due to the stuttering. This problem has lasted for over a month, please fix it soon.