Okay, laptop, WTH already...

I recently got a new Lenovo, with Windows 8. It’s a departure from the old Mac, but I’ve been getting comfortable with this new keyboard configuration and the different functioning of some of the keys. Sometimes muscle memory kicks in and I try to type on the Mac while using the Lenovo, and I’m learning to recognize when this has happened. However, it’s still doing a few things I’m relatively sure aren’t a result of user error.

For example (and this has happened a few times today), I’ll be writing a long bit of text (such as this one) and with no warning, the entire page will reset and I’ll find myself on the site’s previous page, with all the entered text gone into the ether. It only happens when entering a lot of text—not when just surfing, entering passwords, etc. Is there a key on the PC keyboard I’m inadvertently hitting, or is a setting not quite right? (Or, does this thing just want to go sailing out my second-storey bedroom window? Probably not the case, but it’s an entertaining thought right now :p )