1020 shuts down at night - requires soft reset

I am on my second 1020 .  First one had a faulty audio jack.
This one shuts down at night inexplicably.  I wake up to check email in the morning and the screen is black.  No buttons do anything.  My only hope is to soft reset.  I charge overnight using the charger that shipped with it.  Twice it has happened while charging.  Once it happened while not charging.  I've had one other likely unrelated crash - while on a call I hit the camera button by accident and the screen turned a rainbow of colored pixels.  Had to soft reset.
I emailed Nokia support - nothing.  I'm assuming I should take this 1020 back as well but I can't keep dealing with faulty phones.  I tried removing a bunch of apps from my start screen and didn't seem to make a difference.  All I have is basic stuff - phone, email accounts, facebook, store, xbox music.
any suggestions or best to assume some faulty hardware, perhaps memory?  It has had a shut down 4 of the 5 nights I've owned it.

No not exactly - that particular phone did better by ensuring I killed all app background tasks (check settings periodically as apps turn them back up after updates and running for 1st time), and using the back button to back out of apps instead of hitting the home button.
However - that phone got stuck in a funky state where it thought the phone had a headset plugged in even when it didn't.  So it was returned, and I'm not on my third 1020.  The reboots on this one are worse then the prior 2 in frequency - happens once or twice a day at least.  The only benfit of this one is that it doesn't lock up like the other one did.  It will reboot and come back gracefully. Background tasks and backing out of apps hasn't helped this behavior.
What is baffling is how all three of my phones despite being set up the same have had very different  behaviors in terms of random restarts.

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