Spark client can't see all users even all user are login?

My xmpp server is openfire 3.7.1 and I have 100+ users are using wthin officer hours from 9 am to 6 pm every day except sat and sunday.

Now I am getting face one problem seriously. All cient app are spark. Occasionally, I got complaint from some uers is they can see only a few users at thier friend list.

I tried to logout and login from IM but nothing special. After one or two hours, they can see all users at thier friend list.

That is not a big problem but it makes me disgusting. I can’t find any error in server logs.

So, I hope you can advise me as much as you can. I will be waiting yr reply as soon as possible.

Thanks with best regards,

Dragon.

Message was edited by: Dragon