It seems likely from your description that moisture is condensing into the finish. Lacquers of this type cool the air immediately above the wet film as the solvents evaporate, and cooling the air can lead to water vapour condensing out and into the film. If this is the case the answer is, as cornucopia says, to warm the air in the finishing area to prevent this happening-- warmer air lowers the atmospheric RH, which is the key here.
An alternative might be to add 2 to 5 percent of lacquer retarder, sometimes known as anti-bloom thinners. This slows down the rate of solvent evaporation from the wet film thus reducing the chilling effect. A characteristic of lacquer retarder is an overall slowing down of the cure of the applied film which can leave the the finish more likely to suffer from dust, bugs, etc dropping in to the film and becoming embedded, along with blocking and imprint damage being likely for extended periods, sometimes unacceptably long periods if you use a lot of lacquer retarder. Warming the air in the finishing area, and keeping it warm for several hours after should help considerably making it less likely that you'd need to use the retarder. Slainte.
