I started charging my Lumia 928 with the Surface charger about a month ago. It charged it fine and quick. Only thing I noticed was over the past weeks the Surface has been saying 'plugged in, not charging' more and more and now it doesn't charge it at all. Does the same thing on my mom's Surface 3 too. It never did that before I started charging my phone with it regularly. Coincidence? Anyways contacted support and they're sending a replacement charger. Not planning on charging my phone with the new one. Just me though.