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After living for a while with this problem, I found the time to investigate it a little more and it is now SOLVED. The problem wasn't connected to the firmware update but it appeared at the same period that I installed the new Visual Studio which has a Hyper-V add-on to support the Windows Phone...

I have the SP3 for a month. Everything was fine for me (including wifi access and sleep, suspend etc.) until the last firmware update. Now even if I close the lid for a second (or the device sleeps by itself), I need to long-press the power button and wait for 35-40 seconds to return to the...