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Windows RT 8.1, Windows 8.1, or Windows Server 2012 R2 freezes when you use a Bluetooth LE device

Symptoms
When you use a Bluetooth low energy (LE) device such as a mouse or keyboard on a computer that is running Windows RT 8.1, Windows 8.1, or Windows Server 2012 R2, the memory usage of the Wudfhost.exe process keeps increasing. Then, after some hours, the operating system freezes. 
Cause
This issue occurs because of a memory leak in the Bluetooth LE HID mini-driver (HidBthLE.dll).
Resolution
To resolve this issue, install update 2919355. For more information about how to obtain update 2919355, click the following article number to view the article in the Microsoft Knowledge Base:
2919355 Windows RT 8.1, Windows 8.1, and Windows Server 2012 R2 Update April, 2014

Status
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
More information
For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:
824684 Description of the standard terminology that is used to describe Microsoft software updates
Properties

Article ID: 2934794 - Last Review: 04/09/2014 00:38:00 - Revision: 1.0

Windows 8.1 Enterprise, Windows 8.1, Windows 8.1 Pro, Windows RT 8.1, Windows Server 2012 R2 Datacenter, Windows Server 2012 R2 Essentials, Windows Server 2012 R2 Foundation, Windows Server 2012 R2 Standard

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