I've had the same thing happen to me. I started having memory problems. I would go to town and supposed to stop at A, B, And C and would go directly to C and forget all about A, and B until I would get nearly home.
I had an MRI and it showed I had had a small stroke.
I recall the day it happened. You would think I would have realized. I was at the lake for the weekend and I woke up confused and had trouble walking straight (I felt like I was wading in water) and had my speech was slightly slurred. My husband said it was just stress because my step son was on Meth and my brother was called to duty in Iraq. I knew I was stressed, so I chalked it up to that. Since then I get confused easily and when it happened and I returned to work after the weekend, my handwriting was slightly strange and I had trouble spelling. I just found out about the stroke and saw the Neurologist who informed me but that weekend was the time it happened, and now I wished I had known.