Problems with Yosemite (reboot and choppy screen image)

I recently upgraded to Yosemite. I have a MacBook Pro Retina 15" and am running 10.10.2
In all my years of using OSX I think I have been forced to do a hard restart MAYBE 6 times. Ever. And I've been here from the beginning of OSX and before. Since updating maybe two or three weeks ago I have had to hard restart about a dozen times. I am disappointed. The computer becomes non-responsive, yet I don't see the spinning beachball. It just - freezes. I hold down the power button and chug along until the next time.
Additionally, occasionally when using safari the screen gets kind of separated. For instance, if I click on something to go to a new page, part of the screen remains on the old screen and sort of flashes back and forth from old screen to new screen. IDK if that makes any sense. I've not been able to figure a pattern as of yet.
I'd like to know if anyone else is experiencing such oddities. Also, if anyone has any idea what I can do about these problems I'd be happy to entertain them.

You can also try the Safe Mode to reset things.
Try booting into the Safe Mode using your normal account.  Disconnect all peripherals except those needed for the test. Shut down the computer and then power it back up after waiting 10 seconds. Immediately after hearing the startup chime, hold down the shift key and continue to hold it until the gray Apple icon and a progress bar appear and again when you log in. The boot up is significantly slower than normal. This will reset some caches, forces a directory check, and disables all startup and login items, among other things. When you reboot normally, the initial reboot may be slower than normal. If the system operates normally, there may be 3rd party applications which are causing a problem. Try deleting/disabling the third party applications after a restart by using the application un-installer. For each disable/delete, you will need to restart if you don’t do them all at once.
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Safe Mode - Yosemite

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