If an example sentence were provided, looking for an answer would be easier, but I like the word "transience". The adjective 'transient' related to it may be used in a construction like "transient nature of", the word nature being the core noun there:
"The transient nature of any value fixed to a piece of land makes it impossible to make sure that any division scheme fair at the moment would still be be fair after some time has passed".
There are synonyms for transience like ephemerality, fugacity, but they belong more to the belles-lettres style of writing.
Related words: unreliability, unpredictability, inconstancy, impermanence. These may be 'adjectivized' and used in constructions like "unreliable nature/character of...".
It really depends on what you're talking about.
We do actually use fly to describe things that are up in the air but not literally flying, most notably, for flags.
As to the specific examples, there are many options. Including ones you note, there's flap, flutter, float, blow, billow, dance, ripple... and many more. It's all about what sort of emotion or feeling you want to give.
For example, pieces of fabric such as a curtain or sheet might be described to billow:
The curtains billowed in the breeze.
Or, in a stiffer breeze, to flutter:
Flags fluttered in the breeze.
If you want to be fancy, you could even say something like:
The clothes danced on the drying line.
This gives a very fun and energetic feel, the opposite of billow.
Hair, on the other hand, would probably float in a soft breeze or fly in a stiff wind.
When the breeze blew, her hair floated in front her her eyes, hiding them from my vision.
Her hair flew into her face as the wind blew around her.
Whichever word you use is part of the artistry of the English language. As you see above, words relating to both air and water movement are possible, and it's largely a matter of personal preference. If you start trying things out, be sure you are able to visualize the movement you're trying to describe.
Best Answer
This is a latent problem.
Latent problems lie undetected until they manifest themselves in a failure.
More widely, anything can be described at latent if it is present but undetected. For example a disease could have latent symptoms - you don't know that you have the disease.