Back to crashing every 2 minutes or so after loading in. I have spent a chunk of today playing No Man's Sky though, which has been perfectly stable, so I'm thinking my hardware is fine. I've put a support ticket into Square Enix, hopefully it's something they can patch out, and soon.
If you have a Square Enix user account you can raise a support ticket here : http://support.eu.square-enix.com/contacttop.php?id=11886&la=2
The more people report the problem, hopefully the sooner it will be fixed.