New push mower with B&S 6.25 torque rating. I'd almost finished mowing and when I went to restart after emptying the bag, the pull cord wouldn't pull, at all. Checked to see if anything had become lodged in the blade and there wasn't, so I wheeled it back to clean it up and get it ready to return it to the store then tried one more time just to make sure. It pulled and started right up.

Does this sound like an indication of a serious problem or could it have been a temporary glitch of some kind?