I read books thru the kindle store and my book keeps shutting down. any suggestions?

Try a reset: Simultaneously hold down the Home and On buttons until the device shuts down. Ignore the off slider if it appears. Once shut down is complete, if it doesn't restart on it own, turn the device back on using the On button. In some cases it also helps to double click the Home button and close all apps from the tray BEFORE doing the reset.

1. You can try logging out and then back into your Amazon account in the app
2. Contact Amazon support.