Dine

When I turn on my PC, one of my case fans seem to be making like a clicking/grinding sound. I just recently replaced the front 2 stock case fans with Corsair AF120 LED fans. One of the original fans did the same thing and I can't figure out what it could be. I took the inside of my pc apart the other day and it fixed the sound issue for about a day. The back two on the radiator are still stock from my prebuilt. What could this be and how can I fix it?! https://streamable.com/lvagkf