I am surprised no one else seems to have had any serious problems with the most recent technical preview build 9860. Immediately after it was installed it wouldn't lock onto a wifi network and continually bounced back from one available network to another. Once it finally locked on, the CPU never ran at less than 40%, even at idle, killing battery life and always running hot. Reverted back to the previous build and all is well. I would have thought this would have been a Marvell driver SP3 issue. I wonder why I am the only one experiencing this. I have reported it. I'll wait for the next build and consider updating.