Pages hanging…

This just starting happening today…I’m wondering if it is a server issue or something else..

All of sudden certain pages will hang and not refresh. For example, when you post a comment, the page will hang on https://www.siteurl.com/wp-post-comment.php and just show a white screen. Same thing happens after you moderate a comment (hangs on moderate.php) and after you write a post. Nothing has changed lately, except yesterday I installed the new stats plugin. When this started happening today, I deactivated it, but it still hasn’t solved the problem. Any ideas?