So this may not work for everyone, but I have found a workaround on my phone that lets the Dex Desktop startup up everytime. You have to get the desktop to start at least once for this to work. For me, I had to unplug the power adapter, and the keyboard and mouse, then plug the phone into the Dex, when the popup comes that says you need and external power supply, plug that in and then hit okay. I finally got dex to load this way. Then you can plug in your mouse and keyboard. Now the trick I have found to get it to load next time I hook up to the Dex, before you disconnect your phone, bring up the notification panel. One the Using Samsung Dex notification, click Screen Mirroring. Once it switches to screen mirroring, unplug your phone. The next time you plug in your phone it will automatically go to screen mirroring. Bring down the notification panel and on the Using Screen Mirroring notification, click Samsung Dex. And the desktop loads everytime for me. Hope this helps so people. It was really annoying until I figured this out.
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