Website slow down (reason unknown)

Hello everyone,

My website: https://www.1vibe.net

To make things clear, i am using 2.3.3 because when i was installing the latest version of wordpress on my server i experienced the same problem i am having now. The site has been fine for about 3 weeks or so. Today out of no where, my website slowed down, everything from admin panel, to the site itself. Here is what i have done so far to resolve or find out the problem:

1. Checked the status of my server and it is doing fine, ftp loads fine, other sites on the server load fine, so it leads me to believe it is a WORDPRESS error.

2. The last thing i did was make my latest post on the blog. Now the weird part was when i clicked “publish” the post the next window usually is just the post page reloading but what i got was a white simple wordpress window (didnt seem part of the admin panel) asking me if i wanted to make the post or not giving me two buttons “yes” and “no” i clicked yes. This is the last action done before the slowdown was noticed.

3. I know that none of my plugins are causing the problem because i have tried to deactivate them and no fix. I did notice something that was not there before when i go to plugins > XML-Sitemap – Here there is a msg at the top saying “Your sitemap is being refreshed at the moment. Depending on your blog size this might take some time!” im not sure if this could be the problem or not?

4. Also another thing that may not be related but i think is worth mentioning is that today i received a few spam comments which i quickly removed.

So other then the above info, from the knowledge that i have, there is nothing that i can say i know of that is causing the problem. Also my server guys tried to help me when i was first doing the installation with the latest version of wordpress and they also could not figure out the reason for the slow down.