Hi! I have the same problem and the reason is because, although I don´t really notice, my eyes cry (bit by bit) along the day. This also happened to my grandma, so seems to be hereditary. I know it may sound weird, but seems to happen when eyes need more moisture and need to get self-cleaned. This happens to me specially when the weather is windy or very cold outside. Anyway, it can happen at any time. As I said, nobody notices, not even myself, as it is imperceptible, but there it is and it smudges my makeup in the outer corner so I have to retouch at least once or twice a day. Primers help a bit but do not solve the problem I´m afraid, so I have not found anything better yet
