There are three of us having issues. We started with a SP4 i5/16GB/512GB and moved to a SP4 i7/16GB/512GB. We are running the latest Windows 10 (Insiders). And we are are both experiencing an annoying PITA issue. Closing the cover, pushing the power button becomes a game of roulette. 9 times out of 10, the machine must be powered off to get it to come back on. At least with our SP3, it had a Windows button on the screen so you could tell if the machine was off or in the BUZZ-BUZZ-BUZZ mode, where you hit the on screen WIN button and it would give you a buzz. So at least you knew it was still "trying". But with the SP4, MS in their infinite wisdom removed the WIN-power indicator from the screen. So back to the issue. Why is it that when the SP3 came out, we had THE SAME EXACT ISSUES. Now the SP4 comes out, and on two different models, 5 devices, SAME ISSUE. I can put the sucker into HIBERNATE, and come down in the morning and find it's warm, battery almost dead. HIBERNATED!!! Sleep is even worse. Fan cranks away. Come one. Get your act together MS. Release the hardware WHEN IT WORKS, don't put these out as usable devices, not a world wide beta test while you fix the firmware!