There's a "status bar lock" option, double-check that you haven't enabled that

.
Otherwise, I assume you're talking about our actual status bar (i.e., the bottom one) so we're going to need more details, as "The bar will go away with a page turn and a couple of other actions but otherwise persists." doesn't make any sense without more context.
What actions? What do you mean by "go away?".
If you could share you
settings.reader.lua config file (it's in the .adds/koreader folder), that might also help us diagnose/reproduce this

.
(Because it's not entirely out of the realm of possibilities that a specific combination of settings could be broken, but that's... a lot of potential combinations, so having the config file should help avoid a lot of running around like headless chickens

).