When dungeon crawling, sometimes one can get a battle at the same time as they move on a Tile with an event or other action... If you don't cancel the action, the game softlocks as there is dialog/choice in front and battle in the background. At least when changing floors if you actually move to a different floor, the battle cancels and game becomes unresponsive to any key presses .-. It's still responding, just clicking does nothing.
Should be an easy fix, just look at the tile u move to before firing an encounter event and check whether it's empty. It happened to me at a campfire and an event as well.
On unrelated note, the speed at which one moves is pretty slow even with the fastest speed possible
Haven't finished even one playthrough yet, but New Game+? wink wink
Edit: Might need further testing, after finishing that dungeon run, it hasn't happened even once