The only potential problem I can see is:
Code:
10 Spin_Retry_Count 0x0033 135 100
https://en.wikipedia.org/wiki/S.M.A.R.T.
Quote:
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Count of retry of spin start attempts. This attribute stores a total count of the spin start attempts to reach the fully operational speed (under the condition that the first attempt was unsuccessful). An increase of this attribute value is a sign of problems in the hard disk mechanical subsystem.
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I would replace the hdd to verifiy if it is really the issue in your system. If it still happens, check ram, cable connectors, power supply etc. I had computers where I just had to re-insert the ram sticks and everything was ok again :/
I use Macrium Reflect too, it's a very solid backup tool. Can 100% recommend.