You mean when you take your iPad and walk off without your Bluetooth keyboard? In that case, you should just disconnect since you aren't using the keyboard anymore anyway. Either that or wait until you get out of range. It'll disconnect automatically.
I'm not even understanding why this is even an issue. It pops up when you select a text-form to type in, and goes away when you don't need to type anymore.
Pakaku...if you don't understand the question, why are you responding? LOL Go find out why what you said ("It pops up when you select a text-form to type in") does not always work and why that's the problem.