Hi everyone. So recently my stock macbook toshiba hdd failed in my mid 2012 13" macbook pro, I replaced it with a samsung 850 evo because I heard good things. I couldn't get my hdd to clone because it was failing so I cloned my friend's to the ssd to have a bootable drive. I then wiped the drive of everything and made a new admin user. I didn't notice any of the good things people notice, aside from booting faster. It's like it hangs frequently, though there are bursts of speed I can't even run say a flash game before everything starts to bug out, I can't download something before it slows everything down. On top of this, frequently, it's like the ssd's contents become unavailable, I won't be able to launch applications (they'll be missing from spotlight) or save documents, and then I'll have to restart. It affects literally every program, nothing can update. Firefox will tell me it can't open because there's another version running, word will tell me it can't save because it's missing the index, there are so many errors I can't even keep them straight and I can't even screenshot because when it does this nothing saves. I tried repairing the drive in disk utility but I get the error message "Couldn't create temporary directory." I'm honestly confused in every way. I'm thinking I may have gotten a faulty drive, or maybe I did something wrong, but either way I'm lost and any help would be greatly appreciated.