Below is the latest response I received.
How can I tell if my card is unmounting or ejecting in safe mode?
Has anyone else tried all of this? Could it be an incapatible app?
I have moved everything off my SD card but it still unmounted and ejected in regular mode.
I have checked all the resources available at my end and do not see any reported issues. In this scenario, I will provide you with a few troubleshooting steps which should fix the issue. If the issue persists after performing the troubleshooting steps, the write back to us for further assistance.
For the SD card ejecting and un-mounting issue, please follow the below troubleshooting steps:
Please check the SD card in alternate phone or PC and check for the results. If the issue persists, then please contact our SD card support who will assist you resolving the issue. The email support you reached is limited to providing technical troubleshooting steps for U.S model Samsung phones and carrier based tablets. I will share you the link to contact our live SD card support.
Our SD card support is available from Monday – Friday, 9 am to 6 pm EST.
You can also contact our SD card support at 1-800-SAMSUNG (1-800-726-7864) available 24 hours a day. Every day.
For the phone rebooting please perform below troubleshooting steps and check for the results.
1. Perform safe mode and check for the results.
Certain third-party or downloaded applications may interfere with the functionality of the mobile. It may be necessary to boot your mobile in Safe mode if you wish to isolate whether or not added applications are causing problems with the mobile. Safe mode will load only basic system software. Follow the general steps given below to boot your mobile into Safe mode.
a. Power OFF the mobile.
b. Press and hold the Power key.
c. When the mobile vibrates; release the Power key and immediately hold down the Volume Down key
d. Keep pressing the Volume down key until the mobile boots up completely.
e. If successful, Safe Mode will appear on the mobile screen in the bottom left corner.
If the SD card works fine in safe mode, then the issue will be with third party applications on the phone. Please uninstall all the recently installed applications on the phone.
If the issue persists, please perform the factory reset for the mobile. In most of the cases, a Factory data reset will resolve many issues you are experiencing with your mobile. This brings the handset to factory default settings. These steps will completely reset the mobile deleting ALL settings and all data on the handset (including phone book entries, pictures, games, and messages). Please back up the data before you perform the factory reset on the mobile
Before you proceed with the factory reset, please backup your data and then perform a reset on the mobile
Please access the below web-link to know about the Samsung smart switch.
Please try to install the Smart switch application on your PC and connect your mobile using USB cable to transfer the data.
Direct Download for PC:
Please access the below link for the steps to transfer the data on the mobile using the Smart Switch.
Once the backup procedure is completed, you can perform the factory reset steps on the mobile.
To delete all of your personal information from your mobile, from the Home screen, touch Menu > Settings > Backup and reset > Factory data reset. Read the information provided, then touch Reset device > Delete all.
Please perform above steps and check for the results.
Hope the above information helps you.
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Should you desire additional assistance, we invite you to access the web-link http://www.samsung.com/us/support/contact to speak to a Chat Specialist. Our technicians are more than happy to assist you further. Chat Support is available 24X7.
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To save you the trouble Kitty, it's not a third party application. I've done the test myself, but if you really want to do it yourself then encrypt your SD card and then put it in safe mode for a while. Reason being? It will show the encrypted SD card notification everytime it remounts itself, unlike it will if it's not encrypted. Happy troubleshooting!
I have the same apps I used on my S5 on my S8 plus, and never had an issue.
I ended up removing everything from the SD card ( apps, music, documents, and photos) and have everything in my internal storage. Waiting to see what happens.
I can also confirm it's not 3rd party apps because everything I have on my SD card are music files, pics, and videos only. No apps whatsoever, not one. So it's definitely the phone.
To be clear, it's not just 3rd party apps on the SD card, but they mean on the internal storage as well. They believe there to be a possible interference with any app on the phone internal or external storage. Either way though, yes it is the phone.