Application Hang when user click claim & edit - urgent!

Dear all expert,

Kindly please help. we encounter a problem when user login to web application (Lotus workflow). When they try to claim and edit a document, the system become very slow and hang. But it is working fine when in lotus notes (non web). Previously this issue occur, we restart the server and everything is fine. But it happen again and we really need to fix this problem up.

Kindly please advice.

Thank You.