Hi
I moved your post into its own thread because the problem sounds different than the ad loading problem.
The Support Forum is part of the same database and script pages that display the other forum topics, so anything that affects the forum affects it as a whole.
What is night for you? I hope that doesn't sound silly, lol. But do you mean 8pm or 2am? You might be trying to access during the time when server backups are created, as this is a resource intensive process. The site could appear sluggish or could even display a message that the server load is too high and for you to check back later.
I don't know what time the server backups are processed, but most sites do it sometime between midnight and 6am.
That could be what you are experiencing.