That's a really interesting question, and questions like this were areas of active research in the earliest days of tissue culture; or specifically how to do the opposite, some times: how to effectively get the properties of soap without the bubbles.

Google tween 20, which is a product made for this specific purpose. However, I do know that in a lab setting, it maintain its properties a deal longer that 24 hrs.

I think your answer would depend on the nature of the soap solution used to create the bubbles. My guess would be that something is being oxydized, and with exposure to oxygen, the molecule responsible for the bubbles is reduced and not as effective.

The best bubble solutions aren't stable. The water part of the bubble mix might have evaporated some, and surfectants alone doesn't do much without the surface tension of water holding things together

Try adding a little more water to the solution and stirring. Also, make sure the air where you're blowing bubbles isn't too dry.

I don't know for sure. My only credential here is that the #bubbles tag is mostly my posts.

When I was a kid, my folks used to put what I believe was water and dish detergent in sealed plastic containers, and it'd be fine months later. So it's definitely not true of all bubble solution.

Since there are many great answers already, thinking of other different ideas

Does shaking the box help? In which case it's possible something separated

This is a fascinating question. I flipped through my book on soap bubbles and soapy solutions which is actually a great book but it doesn’t have anything on deterioration of bubbly solutions.

My conjecture is some interaction with oxygen, but I can’t be sure without any information on its composition.