just an update. I received the new SP3 (kickstand is much better, my unit would not support itself). I installed Win10 10162 and was good. I used the .msi file for the June firmware (going directly from an older 2014 version preinstalled on it) and I now have the double flash again. That means it wasn't just from the May firmware. What ever caused it is still present in the June release it seems. Starting to think it's a combination of Windows 10 bugs and firmware bugs together causing it.