I have had my X120e for a while now and am happy with it. The normal fan noise has not bothered me, but lately I have been hearing some strange noises from the fan when I hold the laptop at an angle.
If I start slowly turning it onto its right side, I hear a noise from the fan that sounds a little like the fan is catching on something inside. This noise stops after two seconds, but resumes as I continue to turn the laptop. I have already opened it up and tried blowing into the fan, dislodging some dust, but it still makes the noise sometimes. The laptop continues to function normally when I hear this noise.
What could be causing this? Is it something I should worry about?