Okay finally got my withdrawal after 22 hours.

#What's the reason behind those manual review?
#Not getting any support reply for long time I have nothing to do without posting here.
Manual withdrawals were taking 4-6 hours before. But now it is taking more time. It is long time we had instant withdrawals at goup!
Looking at the fact that you have made more than 20 withdrawals and the amount from your latest withdrawal which is only 0.013btc (0.003 profit from your deposit). I do not think there is something suspicious that force them to do manual check. 20 withdrawals means that you are loyal players here if you made the profit from your own deposit. Admin is indeed needs to inform player the reason behind the manual review, so players knows what to avoid if they do not want to face other manual review.