CTRL key getting stuck in 2012 RDS session

We have a 2012 R2 RDS environment. Clients RDP in from Windows 7 clients, fully patched, including RDP client 8.1, utilizing RDWeb to connect to remote session.
We have been having issues with users having the CTRL key stuck in the remote session. There is a group policy that locks a users local computer after 15 minutes of inactivity. So, users walk away and when they return their computer is locked. They hit CTRL-ALT-DEL to unlock their computer, then they log in. Now, they open their RDP session, and the CRTL key acts as if it is stuck. For example, if they are in Outlook, every email they click gets highlighted, or if they are in IE, and type 'N'' a new page opens.
We have found the way to fix this is to tap the CTRL key a couple times, and it fixes the issue. This is not a solution though, just a workaround. I have found many articles about this being a problem on 2008 RDS, in which hot fixes were released. However, I have not been able to find anyone with this issue on Server 2012 RDS yet.
Any ideas?
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Brett DanneyIT ArchitectCommented:
This is a strange issue. The only two things I can think to try are to turn off sticky keys:

Or alternatively disable the server requiring to have ctrl, alt, del pushed to login. This can be done from a group policy, users will still need to login just the screen saying push ctrl, alt, del to login disappears and is replaced with a normal login screen.

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CCtechAuthor Commented:
Thanks, Sagi,

    Sticky keys are disabled. As a temporary work around I have disabled the interactive logon requiring ctrl-alt-del. Thanks for the suggestion.
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Windows Server 2012

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