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I got told remove my charge 2 from phone app, go into settings, about and look for shut down at the bottom of menu. It shut down no probs. I clicked the main button and it came back on with all data still there and now is syncing again.
Go to settings, about and scroll down to Shutdown. Click this and wait a few minutes. Press the single main button to power back up. This is what I was told and worked for me with no data loss.