Why is my rotary tool making a squealing sound?

Why is my rotary tool making a squealing sound? Last week my device starting making a squealing sound after an hour of use and I don't know what exactly started the problem.
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Total answers/comments: 1

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bert [Entry]

"This might mean the bearings of the fan is faulty, this problem might also cause overheating issues.

More information can be found here."