Cannot Download Export File in WordPress

I’ve never had an issue before with creating and downloading XML files of all of my WordPress posts, pages, comments, custom fields, terms, navigation menus and custom posts to save onto my computer of my site until now. The last time that I’ve successfully downloaded a file was in June 2015.

For the past several days, I’ve tried downloading a copy but the file would say “failed”. Sometimes, I’d have to completely close the browser in order to log back into WordPress, because the browser will continually say “connecting” and not let me retry or go to my WP dashboard.

Today, I’m seeing an error message, and it’s still not allowing me to download an XML file of my site.

C:\Users\PINKRO~1\AppData\Local\Temp\H51PONhh.xml.part could not be saved, because the source file could not be read.

Try again later, or contact the server administrator.

My website is: http://mikeposnerhits.com

Any ideas why this is happening? How can I resolve this, because I’m clueless right now? I’ve never had an issue with this before. Could it be a plugin conflicting with the export, and preventing it from downloading. I’ve tried deactivating ALL plugins and switched and activated the Twenty Fifteen theme, and that still didn’t work.

My active and installed plugins:

Akismet

Captcha by BestWebSoft

Compact Audio Player

Exec-PHP

GigPress

Optimize Database after Deleting Revisions

Share Buttons by AddToAny

SoundCloud Shortcode

WordPress Related Posts

WP Super Cache

Yoast SEO

Side note: I did try asking my host with help and they didn’t know what could be an issue, but did suggest deactivating the plugins and switching to a different theme. Also, I did log into my 2nd WordPress install, it’s just for theme/layout testing only. I was able to export a file perfectly fine from there.

Thanks in advance for any help with this issue!