MBP seizes up on wake up with Yosemite and too much RAM

This is part question and part warning for the good of the community if this is happening to anyone else.
Setup:
MBP 13", Early 2011. 2.3Ghz i5.
16GB of RAM, 2x8GB (Apple says a max of 8GB is allowed), it originally had 4GB, 2x2GB.
Admittedly, I've "over RAM'ed" the machine. However, it was fine under 10.9.5.
Moving up to Yosemite 10.10 caused really odd behavior. I'd boot up the machine, no problem. Close the clamshell, wait 20 minutes. Open the clamshell. Blackness. The only way to revive the computer is to press and hold power button or about 10 seconds and let go. Then press power button again. Heartbeat led appears, screen revives but shows the resuming from hibernation loading bars at the bottom of the screen. Like what you'd see if the machine had been left to run out of power and go into a deep hibernate state and you plug it in and turn it back on.
Steps I've taken:
Apple Hardware Test (reboot, hold option-D to get blue screen testing suite), both normal and extended test (extended took about 2 hours). RAM checked out fine.
Re-installed a clean copy of 10.10, previous had been an upgrade. Wanted to make sure there weren't any cobwebs that might be causing this.
At this point, I've removed one of the 8GB chips to put the machine to it's recommended limit of 8GB in one chip slot. This seems to remedy the behavior. I'll wait until 10.10.1 is released, put the chip back in and see if it still does it and will continue to do it with each release until it behaves.
If anyone has any other recommendations or troubleshooting tips, I'd love to hear them.

You may have gotten some bad RAM.
The 2 places I’ve seen recommended most to buy reliable RAM are below. I have purchased RAM several times from Other World Computing and have always been very satisfied with the product and service. They have on-line instructions on how to replace the RAM. OWC has also tested RAM above what Apple states is the maximum. I now have 6GB installed on a machine supposedly limited to 4 GB.
Crucial
Other World Computing

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MBP seizes up on wake up with Yosemite and too much RAM

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