Hi [NAME] think the post that led me to put the pieces together was this oneMagnets and Dell laptops FYI (Causes shutdown) - Ars Technica OpenForumI wear a Samsung pro 5 with a titanium strap that closes with a strong magnet.To be fair the more I google about this, the more I realise it's not limited to dell, but at the time it was the last thing on my checklist of things to rule out. The clue was the OS wasn't crashing and was always asking me to log back in after pressing a few letters on the keyboard. Id log back in and the text was still there.I'd just ask on new laptops, that dell puts a removable sticker warning of sensitivity to magnets (i.e. watch strap causing the system to think the lid is closed)Cheers 
This isn't really a request for help but more a PSA as well as a request to Dell to place stickers on the keyboard palm rest. Long story short I took delivery of an Alienware X17 and during setup, the keyboard and monitor randomly shut off, but Windows wasn't crashing. Having believed to have an expensive doorstop on my hands, I took to searching and came across a post, similar to mine, that narrowed it down to a magnetic watch strap causing the issue. Imagine my laughter and annoyance when upon taking my watch off and well out the way the laptop worked fine. Whilst I'm relieved, this is a poor show, and a removable sticker based on the palm rest (where I assume the lid sensors / magnets must be) would have saved a lot of time. Had I been less technically minded I would have been straight on the phone requesting a replacement laptop. Whilst Im aware of the effects magnets have, I have never encountered this on any other laptop so assume this must be something proprietary to dell. Thanks.    
Don't wear a watch with a magnetic watch strap it would seem?