404 Errors on back end pages

Hi all, I’ve scoured the web to find help to resolve my issue, but for the life of me cannot get anything to work. Starting just a couple of weeks ago, all of my back end pages (home page was fine) started turning out 404 errors on them.

Here’s what I’ve tried, without success:
1. Changing my permalink structure from “custom” to default, saving, then re-selecting Custom Structure. This method provides a temporary fix, maybe an hour or two, then the 404 errors return.

2. Commented out this line of code in my function.php file:
“$wp_rewrite->flush_rules();”. That didn’t do anything. I’ve tried using both “//” and “#” before it and tested…still get 404 errors.

3. I use a plug-in called “Redirection”, which allows me to re-direct my theme’s category pages and redirect them to another page. I tried de-activating that and testing to see if the plug-in was the culprit, but after a short time, my 404 errors resumed.

Like I said, this issue just start a few weeks ago. I use Securi Security and had them scan my site for any malware, etc…and the site is clean.

Can someone PLEASE help me with this? Would bigtime appreciate it!

Thanks