Thunderbolt drive problem after 10.9.5

Something is happened to the reliability of my thunderbolt Drive, and my trackpad ( external) after the upgrade to 10.9.5. I ran the hardware test, and it was okay. Will I be able to revert to 10.9.4? And, if I do, will this help? Or should I just struggle along waiting for 10.9.5.1?

Reset NVRAM/PRAM
Reset SMC
Please describe the problems you are having so someone can try to help you fix whatever is wrong.

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