No.
Don't purchase any RAM until it is determined that the 2nd RAM module is the problem.
Monitor the notebook for one week with only the RAM module attached to the motherboard.
If the computer is stable then 7 days is typically sufficient to monitor for computer problems.
If there are no computer problems with only the RAM attached to the motherboard and while the second module is uninstalled then you can conclude that the uninstalled RAM or the motherboard DIMM was the cause of the problems.
You can then reinstall the RAM to see if it was simply a seating problem or whether it was related to the mismatched and overclocked RAM.
Once you've concluded that there was instability with the second RAM module and stability without the second RAM module then shop for replacement RAM.
While you're shopping for replacement RAM you can turn on hibernation.
Turning on hibernation also turns on Windows fast startup.
If there are problems related to hibernation again then it can be turned off.
When the new RAM is available you'll install it and monitor the computer again for stability / instability.
If the computer is stable that that will conclude the troubleshooting.
If the computer is unstable with the new RAM then run Memtest86.
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