My system was working perfectly before the latest April updates. Since then I have noticed that my SB loses more power when sleeping that it was before. My Sleepstudy reports show that something called: "Unregistered Device \_SB.PCI0.RP09.PXSX" is 100% active during sleep. Whilst that is not identified on my system, from other posts it appears to be the Marvell AVASTAR Wireless-AC Network Controller (\_SB.PCI0.RP09.PXSX) - not the Networking element of the device, which appears in a different line on my Sleepstudy under the Networking heading at 0%, but some other element of the device which appears under the heading of 'Fx Devices'. Does anyone have any idea what's going on here?