Helix 2 - Connected Standby Issues - USB xHCI Controller and Ultrabook Pro Keyboard

Hi,
my Helix 2015 (20CG001BGE) is somehow not foing into connected standby. The sleepstudy report shows that the Mobile 5th Generation Intel Core USB xHCI Controller has an activity time of 100%, so I think here is the problem.
Furthermore, when I disable NFC the system idle process is taking about 15% of the CPU usage and is preventing the system additionally from getting into connected standby.
Does anybody have an idea how to fix these problems. Thanks!

I installed/reinstalled every driver from Lenovo's website. While the new NFC driver solved the system idle process issue (I don't get why it wasn't updated by System Update), the USB xHCI controller still won't sleep. However, running powercfg -energy I was able to get some more information. It seems that the controller can not sleep, since one of the connected devices won't go to sleep. This device has to be part of the Ultrabook Pro Keyboard, since I do not have the issue when the tablet is undocked. Here are some of the powercfg results:
Hostcontroller ID: PCI\VEN_8086&DEV_9CB1
Hostcontroller location: PCI bus 0, device 20, function 0
Device ID: USB\VID_2109&PID_2811
Portpath: 3
Thanks for your help!

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