Reverts back to dark gray login screen and will not allow me to login

HI!
SPECS 
Retina 15in.
16gb of memory
500 gb ssd.
OS - Mavericks
PROBLEM
I can boot up and login to my laptop - no problem. I have my login set up so that my user name appears and all I have to do is type my password.
The problem is when I try to wake my computer or disconnect it from my thunderbolt display. Sometimes, (more frequently as of late) when I wake my computer or disconnect it from my thunderbolt display my computer will revert back to a dark gray login screen and prompt me to put in my user name and password (First of all the login screen that comes up is different than the one that comes up when i boot up the laptop because it requests me to type in my user name). - once I type in my user name and password it will not let me log in. It will clear both the username and password fields and sit at this screen. At this point I am forced to restart my laptop and log back in. I never have any problems restarting and loging in right after booting up.
Any suggestions on how I can fix this? I do not think it is normal for it to just revert to the login screen and then not even accept my login information.
Thank you in advance for all and any help!

First try a Reset  ( No Data will be Lost )
Press and hold the Sleep/Wake button and the Home button at the same time for at least Ten seconds... (But can take Longer)... until the Apple logo appears. Release the Buttons
If no joy... Try a Restore...
1: Connect the device to Your computer and open iTunes.
2: If the device appears in iTunes, select and click Restore on the Summary pane.
Restoring  >  http://support.apple.com/kb/HT1414
3: If the device doesn't appear in iTunes, try using the Steps in this article to force the device into Recovery Mode.

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