this is a common problem. happens to some fans while some other fans can last much longer, even though they are of the same brand.
one possible solution.
1) get a contact cleaner with has lubricant in it. (from sim lim tower)
2) move your fans away from your tank and switch them on.
3) spray the contact cleaner into the fan. use generous amounts.
4) let the fan dry and cool down.
5) run the fan again and repeat (2-4) until fan runs smoothly.
if it still fails, break out your wallet..........
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