Thanks for letting us know here your experience with your beloved Samsung Galaxy Note 10 that had issues with screen discoloration, mild glitch and unexpected black/screen shut down. I feel and understand why you are worried for a device that you've take care so much. If my device is facing similar experience, I will get worried too.
Before you try out the below recommendations as to your solution, be sure to check if your device's software is updated with the latest version. Please check how to update your mobile device's software in the following order.
Step 1. Go to Settings > Software update.
Step 2. Tap on Download and install.
Step 3. Follow the on-screen instructions.
Step 4. Restart your phone.
Step 1. Turn the device off by holding the Power button until the option to Power Off appears on the screen. Tap Power off.
Step 2. Press and hold the Power and the Volume Down buttons at the same time, to turn the device on. When you see the Samsung logo appear on the screen, you can let go of the Power button while the device boots up. Make sure to keep holding the Volume Down button.
Step 3. If done correctly, 'Safe Mode' will display on the bottom left corner of the screen. If 'Safe Mode' does not appear, repeat the steps above.
Step 4. Once you're in Safe Mode, you can remove the third-party app that is causing issues on your phone.
Exit Safe Mode
To exit Safe Mode, simply restart your phone and it will reboot normally. You can also enter Safe Mode by pressing the Power key, touching and holding the Power off icon, and then touching the Safe Mode icon.
If that doesn't solve the issue, you may submit an error report through the Samsung Members app as follows:
Step 1. Launch the Samsung Members app, and then tap the Support icon for more options.
Step 2. Scroll and select Error reports.
Step 3. Choose a category of your concern. Select "Display".
Step 4. Choose the frequency of the issue you are experiencing. Enter issue details or attach a video or screenshot. Then press Send icons to complete the report.
And if the issue persists, you may bring your device to the nearest Samsung Authorized Service Center in your area. Rest assured that your device will undergo an assessment to pinpoint the root cause of the issue. Our team of Samsung engineers and technicians will guide you and offer solutions to restore it.
or book an appointment with the Samsung Members app as follows:
Support > Book an appointment to set one.
Should you need further assistance and guidance, you may contact us via our Samsung Customer Care support channels below.
Was your phone ever dropped? I remember this same issue happening to my old Galaxy S8, but that was because I cracked the screen months prior. It's likely a screen malfunction.
While your phone is working fine right now, I would advise you to do one of these two things -- preferably both:
1. Run the diagnostic tool from your Samsung Members app. Access it through the Support tab on the lower right hand side of the app.
2. Bring your device to a Samsung Service Center. It's the best way to get your peace of mind back, because our techs will be able to get your phone back up to working order. They'll even have parts ready for you if you book ahead 😄
Let me know what you decide to do and we'll help you get your device fixed :)