@Nethul: Is this happening frequently, or when you are performing certain actions in the app(s), or on your device? Are the apps closing while in use, or while idle/in the Recents section?
Please note that apps can close unexpectedly when performing a scheduled update, however you should see a notification in this instance to inform you that an update is in progress, and to try again later.
To troubleshoot the issue, head to the Google Play Store > Tap your profile in the top right > Manage apps and device > Updates, and install any available updates for the affected apps. I also recommend restarting your phone to resolve any software issues which might be affecting the app stability/performance.
