If you're having the same issue as I did where your phone would change to warm tones at a certain time uninstall the themes that you might have downloadedfrom the galaxy store. After 5 trips to the Samsung service centre they finally caught that it was themes and not setting. So save yourself some time and energy and uninstall any themes you might have installed from the galaxy store. And if you back up your data and do a factory reset don't restore the themes as it will lead to the same issue.
