Yes, is correct.
Like i said, its not all the time.
I think the issue has stoped now.
I cleared browser cache and open a support ticket with one of my client account, i replied the ticket in admin area successfully.
Perhaps its the cache issue.
I have problem with submit buttons in administrator area (domain.com/client/admin
Some time when i click on submit buttons on the admin area, it redirect to home page of domain.com
Where as the whmcs was installed on domain.com/client
This problem usually happen when i want to respond to tickets or activate new order or send email to clients.
Please what can i do to solve the problem?