Apparantly, my 1 year plus old fanco have failed me since my son played the nintendo wii & accidently swing the pull string over the top of the fan, causing it to slow down abruptly. Though it still works, the speed of the fan have been drastically reduced even though it's on speed3. Tried servicing it myself but to no avail.
It was a pretty good fan i must say, so just a word of caution is to be careful of the pull string (for adjusting the speed) to be stowed away if you intend to have any form of moving around under the fan.
I'm looking into replacing this fan & get another. May try out other brands..