It didn't happen at 5 months out for me...rather, it was discovered at my 1-year postop appointment. My blood work revealed I developed a thiamine (vitamin B1) deficiency, and this can affect motor skills due to its impact on the neurological system.
Thiamine is also used by the body to metabolize food for energy, so a thiamine deficiency can result in low energy.
I started taking a vitamin B complex pill twice weekly, which solved the problem.