MacOS 10.15.4 automatic eject sdcard when goes to sleep
Finally I found what my problem it is I open console.app and filter with /dev/disk2 and found out transcend helper eject my disk so I uninstall app and delete helper tools and then reboot.

Command to delete transcend helper tools:

sudo rm /Library/LaunchDaemons/com.transcend.TSSleepHandlerHelp.plist
sudo rm /Library/PrivilegedHelperTools/com.transcend.TSSleepHandlerHelp