If you're like us, you have a lot of apps open from time to time and it's easy to forget that they're using some of your device's memory even if you're not active in the app. So first of all, try force-closing any of the apps that don't really need to be open now. If you continue to have trouble, you might want to actually review your usage stats and see if there are apps that you no longer use/need/want and just go ahead and un-install them. Another alternative is to do a soft reset for your phone. If you tried all of these and are still having trouble, please send us Feedback within the app.