OK, I figured it out. If you press the unlock button on the remote multiple times, it drops the window about an inch each time. Press it twice or three times, and it goes down 2-3". I think the first click simply unlock, then you get into an inch per press after that. If you press and hold, it goes all the way down (as mentioned earlier in this thread). Pressing and holding the lock button when the windows are open will roll up the windows and lock the car.
So what it boils down to is I think I press the button multiple times when the mood strikes. Need to pay more attention and not do that when it's raining. TBH, the times I discovered it in the rain it was probably just done seconds before I went out to the car...if it's raining I want to make sure my car is unlocked when I get there so multiple clicks
So it goes. At least I know now.