Windshield Washer

[Gobird]

Has anyone had any problem with the windshield washer reservoir leaking. I picked my car up from the dealer about 4 weeks ago. When I got it home I checked all the fluids and noticed that the windshield reservoir was a little low. I refilled it. The washer was not used during this time but the washer fluid was down quite a bit. I filled it to the top of the neck of the bottle. In about 4 weeks it dropped down to what looked like the main part of the reservior bottle. I was just wondering if I have a bad,leaking reservoir, or if there is an over flow on these.
Can't tell if it leaks because this one is a daily driver, so can't check floor of garage for leaks.

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02 T-Bird 9293
69 Vette
73 MGB
97 F-150 4x4
2-Seadoo Jet Skies
a dog a cat and a couple hundred fish in my pond