wpmu-dev-seo/wpmu-dev-seo.php has been deactivated

Can I ask what is going on with the SEO plugin?

This is the third time, I am going to have to delete and reinstall.

I have furious clients and I am not happy myself as Google as YET AGAIN placed me miles down in the rankings because this plugin turns off and doesnt' go back on.

Now it doesnt happen anywhere else so why is it happening on shopezy?

I cant' even put shopezy on your site as it doesnt' see it.

I get this error:
The plugin wpmu-dev-seo/wpmu-dev-seo.php has been deactivated due to an error: Plugin file does not exist.

and I have to go and redownload and install again, because it doesnt' work on your automatic download system.