Crazy Yosemite Login Screen.

After I upgraded to Yosemite on my MBP (early 2011), at least once every few days I will open my computer to a login screen that looks like this.
The screen is never frozen, and I can type in my password and log in, but it just looks crazy.
Also, sometimes if I open my computer within a few minutes of having previously closed it, it will load all my previous windows, freeze for a minute, show the login screen like it wants me to enter my password, and then it reverts back to allowing me continue my work.
These are two oddities that I noticed after installing Yosemite, and I just didn't know if anyone else had anything similar happen to them.
Also, before I upgraded OS X, my computer has been running pretty slow and I've observed a couple other weird glitches that I did not document.
Is it possible that my HDD is on the brink of failure?
Any input would be appreciated!

Make a "Genius" appointment at an Apple Store, or go to another authorized service provider. You may have to leave the machine there for several days.
Back up all data on the internal drive(s) before you hand over your computer to anyone. There are ways to back up a computer that isn't fully functional—ask if you need guidance.
If privacy is a concern, erase the data partition(s) with the option to write zeros* (do this only if you have at least two complete, independent backups, and you know how to restore to an empty drive from any of them.) Don’t erase the recovery partition, if present.
Keeping your confidential data secure during hardware repair
Apple also recommends that you deauthorize a device in the iTunes Store before having it serviced.
*An SSD doesn't need to be zeroed.

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