Either, it could be a sign that your window regulator is dying.
Or, the inner rubbers slides justs needs some lubrication.
To solve your problem...
Spraying silicone on the windows sills solved the problem temporarily.
Did you lubricated the glass run channels with silicone spray?
If not, then...
- remove the inner panel and observe the operation of the window. Lubricate the regulator run channel. You may have to buy new glass run channels or a regulator. You don't indicate whether the vehicle is a Coupe or Sedan, nor the year.
Or look at this link...
http://www.acura-legend.com/vbulletin/showthread.php?s=&threadid=9068