Thanks for letting us know your experience here with your beloved Samsung Galaxy phone having issues with camera flash that's not working. I feel and understand that you've cared for your device so much, that if something amiss, you will get worried. But don't fret, I will try to assist you to the best of my abilities.
Before you try out the below recommendations as to your solution, be sure to check if your device's software and related apps are 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 you device.
Reset the camera app.
Open the Camera app > and then tap Settings > Swipe to and tap Reset settings, and then tap Reset.
Clear the Camera App Data and Cache.
Open Camera App Icon > Press the "i" button, scroll to Storage > press "Clear data" and "Clear cache".
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 "Camera".
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 remains, 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(s). 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.