Crucial M500 480gb SSD Replacement for stock HDD on Late 2011 MacBook Pro keeps freezing
I ran into somewhat similar troubles, and discovered that there were many bad blocks on the drive (also from Crucial). Using Disk Utility to do a 1-pass security wipe (choose "Security Options" from the Erase tab in Disk Utility while the drive is selected and ) solved the problem entirely. Do this while started up from another disk (or the Recovery partition if you don't have another disk, like a OS X Install Flash drive).

Also consider installing Trim after you get everything installed, though be aware that there are some issues with Yosemite.