Was flying the other day and heard a weird sound coming from the drone as it flew. It swerved (quickly flipped almost upside down to the right) and then fixed itself. I got the “Propeller Rotating too Fast” alert on the app and replaced the props, but it did not fix the issue. Has anyone had this problem or know how to fix it?

Hello there ryoukarla. I am sorry to know that you are having these error messages and thank you for reaching out. To ensure a safe and enjoyable flying experience with your DJI drone, DJI have added a safety notification feature. This feature lets our DJI pilots know when propellers need to be inspected or replaced. For additional reference I will post a DJI link below to learn more about this matter. Thank you.

https://forum.dji.com/thread-214705-1-1.html

When I have had this replacing the props fixed the issue.  sometimes they can be slightly warped so they are less efficient but not terrible easy to see they are wrong.