Unlock stuck at Welcome screen after idle

I fixed my issue by changing new antivirus software, thanks.

What did you change it to and from?

Thanks for letting us know this to help others..

From Norton to ESET NOD.
Lock and unlock Windows now working, no more freezing at Welcome screen.
I got no problem login to Windows after restart / shutdown, only when lock and unlock.

This thread mark as solved because it did solve my lock and unlock Windows problem.
My computer has been running for 4 days without any problem.
I will keep monitor and update if I encounter other problem, thanks.

P.S. I did run Memtest+ and pass 8 tests last month (on my old unit), forgot to mention that on my first post.

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sdeshpande,

I am not professional on IT field, but you might need to check your Active Directory server hard disk.
Or maybe your network might be congested / poor routing / DHCP.
Just my opinion, thanks.