Hi! I understand that Happy Color is locking you out frequently on your Kindle with Android 5.1.1. Let’s work through some steps to get this sorted out.

First, could you clarify what you mean by “locks me out”? For example, does the app freeze, crash, show an error message, or log you out unexpectedly?

Meanwhile, here are some general solutions that often help with apps locking or crashing:

1. Clear the app’s cache:
- Go to your device’s Settings.
- Tap Apps or Application Manager.
- Find and tap Happy Color.
- Tap Storage, then tap Clear Cache.

2. Force stop and restart the app:
- In the same app info screen, tap Force Stop.
- Relaunch Happy Color to see if things improve.

3. Reinstall the app:
- Uninstall Happy Color from your Kindle.
- Restart your device.
- Download and install the app again from the Amazon Appstore or Google Play Store if available.
- This can fix corrupted files that may cause crashes or lockouts.

4. Check your internet connection:
- A weak connection can cause the app to freeze or lose sync with its servers.

5. Restart your Kindle to clear temporary software glitches.

Because your Kindle is running Android 5.1.1, the app might not be fully optimized for this older OS. If the above doesn’t work, it might be helpful to try updating the device OS if possible, or switching to a device with a newer Android version for better compatibility.

Let me know if any of that helps or if you’re seeing specific messages — I’ll be happy to guide you further!

Are you satisfied with these steps so far?