I've had my 950 XL since the first day of shipping. For the most part, I love it. I finally added an SD card (SanDisk 128GB UHS-I from Amazon) and was excited to finally get my music all available offline (I have less than 10 GB so I like the idea). Anyway, I started by testing a few playlists, got a few downloads done and then boom, it spontaneously rebooted. OK, I cleared off the playlists and selected the app option to sync all music to this device. Every time I fire up Groove now, the phone reboots 3 times. According to my file explorer, no new music has been downloaded. Ideas? Anyone else having this issue?