Galaxy S5 issues

I bought a Galaxy S5 in January and have had multiple issues with it since then.  Among those is that I'll randomly be unable to make calls, and the other day I was unable to connect to the Verizon 3G/4G network.  The biggest one though is that the phone factory reset itself, completely out of the blue, a couple of weeks ago, erasing all of my settings and a lot of data that I had both on the phone and on my SD card.  I suppose my post here isn't so much a question so much as wondering what I can do to get a replacement device since this one is clearly not working properly.  I guess these things started happening after the Lollipop upgrade, but I'm not really sure if that's what's responsible.

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