When you face unfortunately Instagram has stopped error, the first step is to restart your phone. Restart is one of the basic solutions for all kinds of Android issues. Press and hold the power button, and then tap Restart. If the same thing happens after the Restart, go to Settings, Apps, find Instagram and tap on it. Tap Clear cache. To clear data, go to Settings, Apps, select Instagram, and tap Clear data. After that, tap Force stop.