I would want to look more towards this as the cause. When dogs have a heart condition, they will often faint, particularly when you come home from work, when you feed them, or when you go to pet them. This is because the heart speeds up. When they faint, they will fall over and stare straight ahead. Then they get up and act fine until it happens again.
I would really want to look further at this before I felt safe writing it off.
Let me know if you still have questions.