@heder44 – My only thought would be your server is running out of memory. Otherwise, you can check this plugins code, nothing in there even calls the DB directly. We use get_option & get_post_meta only, definitely not modifying core connection properties.
Further, I tried googling the error you mentioned in context with PHP, no results, so either that wasn’t the right error text or it has nothing to do with your actual site and has more to do with your network connections (got lots of results on that error message in the context of network issues).
Hope that helps.