It can be easy to forget that your smartphone is just as much of a computer at the PC sitting on your desk. And like all computers, things sometimes go wrong. Files get corrupted. Apps that worked fine a week ago decide to crap out. If an app on your Android phone has suddenly stopped working correctly and relaunching the app didn’t help, clearing the app caches may get things working properly again.
To start, pop open your phone’s Settings app. Scroll down and tap Apps under the Device heading. From there, find the app that’s experiencing problems—you may need to swipe left or right to either the Downloaded, Running, or All sections—and tap on it.
Once you do that, you’ll be taken to an “app info” screen that provides some technical details including the app’s version number and how much storage space it eats up. Scroll down to the Cache section, then tap Clear cache.
Finally, go back to the homescreen and try launching the problematic app and see if that cleared up the problem. If not, you might want to go back to the app info screen and hit both the Clear data and Clear cache buttons. Your final resort would be to uninstall the app completely, and re-download it.