Used to work really well, but now it leaks.

I have noticed gradual leaking from the bottle, with two consecutive bottles from my most recent purchase. The leaking is gradual, and since the product evaporates quickly, a spill on the floor didn't become noticeable - just wetness along the top plastic side of the mop assembly. An entire bottle leaked itself empty before I noticed it. I am now removing the bottle after use (it operates okay when in use). Is this a defect due to a new design of the bottle? This never happened before with the older bottles. I notice that now the bottles have the liquid within an inner plastic bag, which was not the case before. I don't want to give up on this product quite yet, as I like how it works. But I may have to look for an alternative if this continues and proves to be yet another case of defective products coming with newer flawed design.

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