Buzzing D5

[Tackle_Berry]

So today my d5 is making a loud buzzing/rattling noise on speed 3, but when i change the speed to 1/2/4 and 5 it goes away. Any ideas?

Current setup: (been like this for around 2 weeks with no issues)

 

[Tackle_Berry]

Thanks, was it it just on the one speed it made the noise?I am going to rebuild my loop in a few weeks anyway so will give that ago. Will just leave it on 4 for now.