Macbook pro freezes after sleep, after 6 months of not having that problem

I'm really frustated with my macbook pro. Like the tittle says, my computer freezes after waking up and the only thing to do is use the On/Off button. It is a macbook pro '13 2010.
This problem first happened around 6 months ago. Around Feb '11, i experienced the same issue. First thing i noticed was that the wifi suddenly stopped working. To try to fix it, I turned airport off and then couldn't turn it back on and had to restart my machine. Then when closing the lid and then opening it again, my computer would work for about 5 min and then freeze. Nothing worked and I had to shut it down using the power button.  Then the problem got worse because the computer started freezing randomly. I know it wasn't an application problem because it happened using different apps. I took my computer to an authorized apple service provider and they told me the harddrive had some bad sectors i think, and they replaced the harddrive because I was still under earranty at the time.
Now, Sept '11, the problem came back. First the airport problem happened and now my computer freezes when waking up, the exact same thing that happened 6 months ago. I went to disk utility and repaired disk permisions and still no solution. My warranty expired last month so calling apple won't be of any help. I installed lion the day it came out and was working without any problems until now, so I don't think lion is the problem.
Has anybody had this same problem with their computer? I don't know what to do or how to tell if my harddrive is causing the problem again.

All of the new unibody MBs/MBPs can use (6GB 4X2GB)
But yes you should definitely make sure the RAM is seated correctly and you didn't touch the gold part of the RAM during installation. Though if something was seriously wrong it would have made loud obnoxious sounds while you tried to start up.
Aside from Installation issues, you should reset the PRAM as noted previously. Hold down command-option-p-r at startup until it chimes twice.
OP, looking at Super Talent's website they don't even have 1066MHz chips listed in their DDR3 chips. All I see is a jump from 800MHz (DDR2) to 1333MHz (DDR3).
Either way, I can't imagine you got that great a deal for the RAM that even if it is seemingly the correct RAM you can get better deals in the links I posted in my other post.

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