Joomla Experienced Coder who is familiar with MySQL to fix 404 errors.(repost)

I have a major problem with teachshare.eslasiaguide.com. Links to a major component seems to randomly work sometimes and throw errors at other times. And I don't even change any of the links. I think it is a database problem. I use a component called phoca download and the component itself is well-built and established, so it must be a problem on my site. If you go to [login to view URL] and look at the top menu under "downloads!" All those links work sometimes and throw errors at other times. Additionally in the left module you will see "upload lesson plans" and "Browse by section" those also sometimes throw errors and sometimes don't. After I delete the links and reset them they work. But for some reason they break after time and I have to always reset them. They also fix when I clean the cache sometimes. | | Here is an example: (Working Link) [login to view URL] will randomly to: (404 Broken Link) [login to view URL] As you can see it looks like for some reason the links switch to try and access both the subdomain and the sub-directory. This throws the 404 error. Currently, there are no errors because I reset the links. But I can keep having the links switch like this, or my users will never return to my site.