We all started off as happy Witnesses, except for those dragged into this religion by force as kids.
In my case, I found that there were way too many meetings. Then seeing the new system being constantly pushed back, and finally when I saw a lack of true love in the congregation. And when they hinted that probably there wouldn't be any sex and marriage for the resurrected ones. This added to my sadness.
So what made you lose your joy in serving Jehovah?