Window vacuum leaks?
There are companies that will come out and drill the IGU (insulated glass unit) to allow it to "breath" and vent to inside the home.
The idea is that this venting will allow the moisture to dry to the inside under normal conditions. I am not sure that investing the the repair of a 23 year old window is good math, but you can do it either that way or via a replacement/reglazed sash.
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