I can confirm, that Surface Pro 3 bends BY ITSELF, probably due to heat. I have a bent Core i7 version and here's discussion on Microsoft's forums:
http://answers.microsoft.com/en-us/surface/forum/surfpro3-surfhardware/surface-pro-3-warpingbending/55cdc620-5117-47eb-8066-72e0a912cf93