Life of an average case fan/bearing?

Cgil1987

Distinguished
Oct 12, 2011
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When I start my PC for the first time each day I will sometimes hear/feel excess vibrations from one of my case fans. I can't make out which one exactly but I assume it's one of the cheaper ones that came with my case, a cooler master storm scout. My PC is about 1.5 years old. It lasts for about 1-2 minutes and then I never hear/feel it again until possibly the next time I start it up. Could this be a fan/bearing that just needs to be re-oiled? Or maybe a bearing has gone bad?