There is a large thread about it somewhere how someone had one on order and his order got canceled due to a quiet recall on the i7 models only.
Also had a word with MS as well through customer service and said they are fixing some bugs/issues on the i7 models before they ship them again.
That is why its pretty much not in stock anymore
Ok - kewl.... So there is no recall....Thanks. Like I said - I have had little to no issues with my i7. I have built massive gaming rigs, and servers etc. Not tooting my own horn, but I know what fast is when it comes to computers, and I know how to tweak, water-cool, aircondition, overclock all onboard processors - (RAM, Video, CPU) - I have to say, for a tablet, I mean a stinking little tablet - the SP4 is FAST - and it doesn't "peter - out" when the CPU is taxed. For something I can hold in my hands while I drop the Browns off at the superbowl - I am fascinated. The SP4 is truly a mastery of engineering. I mean come on, a handheld i7 with a 4k Screen and an OS that allows you to install anything- unlike Apple, which requires "jailbreaking" in order to use aftermarket apps / software. OK - dead horse.
Take Care and God Bless (or whoever)