If you have many transactions using the app, while you're catching up, you'll want to close the app periodically using the disconnect option.  If not, it might crash out with an out of memory error.  When I say many, I'm talking over a 100 or 200.  I know many people don't use it very often, but I tend to use it for a lot of day to day stuff, so have a decent amount of transactions on it.