Very strange.
As long as you unmount the card, you should be ok to take it out with the phone on.After you unmount the SD card, do you need to turn off the phone before you take out the SD card?
When you put in the SD card, do you need to turn off the phone first before you put in the SD card?
At this point, it may be faster & easier to do a factory reset & add apps back one by one.Just an update.
I did this settings>storage>unmount SD card, when I did not take out SD card yet, the problem still occurs.
I stop all settings>more>application manager>running>services in use , and settings>more>application manager>running>cached process and stop every services, but the problem still occurs.
I guess I got to uninstall apps one by one later.
At this point, it may be faster & easier to do a factory reset & add apps back one by one.
Try this before full factory reset.
Samsung Galaxy S4 Turn Safe Mode On or Off
If the phone works and problem is gone in safe mode, do a factory reset but if the problem still is there it's your phone
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If I am going to uninstall apps, I just uninstall those apps that appear at the settings>more>application manager>running>services in use , and settings>more>application manager>running>cached process
I can ignore all other apps and all apps appearing in settings>more>application manager>downloaded, sd card, all, disabled" since they are not active so should not be them causing the problem.
Correct me if I am wrong.
The problem still occurs in safe mode. Does that mean it is a hardware problem? or is there still a chance that it is an app causing the problem?