Motor making weird noise

[Simioniuc Adrian Iulian]

Here are the videos, is kind of difficult to hear the noise in the video. Basically it sounds like if the bearing ( if it has one ) is kind of loose or something. The other 3 motors sound strong but that 4th one sounds weak like something is loose. Please sorry for my english! is my second language and I am doing my best here to explain the noise jejeje.

BTW the noise is coming from the left motor.

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Hey , please tell me after 1 year of usage do u still have that sound ? ... one of my motors started to sound like that too