Are you using any apps that aid or have Accessibility functions?
When you factory reset are you choosing the restore option for apps? If an app is the cause starting your device in Safe Mode should reveal if it is a device problem or a bad app. If it is a bad app everything will work as it should until that app is opened. This should show you how to do this; https://www.google.com/url?sa=t&rct...=bOUrpxw5HtQ&usg=AOvVaw2CDGomFDWT2u-LuOL6lyCC
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