Welcome.....and enjoy.
The second hand stopping is the back pressure on the movement caused by turning the crown the wrong way and is normal. I don't recommend it but it can be used to hack the watch. About half way down this thread http://www.thewatchsite.com/21-japanese-watch-discussion-forum/10673-when-last-time-you-hacked.html there is an explanation. Try applying less pressure on crown or pulling it out as you wind backwards to stop this.
The second hand stopping is the back pressure on the movement caused by turning the crown the wrong way and is normal. I don't recommend it but it can be used to hack the watch. About half way down this thread http://www.thewatchsite.com/21-japanese-watch-discussion-forum/10673-when-last-time-you-hacked.html there is an explanation. Try applying less pressure on crown or pulling it out as you wind backwards to stop this.