This the answer from my Host
Hello Qunter,
Currently, I am able to duplicate the issue even at the frontend of the website wherein https://www.eucmh.com redirects to https://www.eucmh.com/wp-admin/install.php and loads the error : The page isn?t redirecting properly . The issue isn’t due to misconfiguration of mod_security and its not possible to check the server logs for this error. The issue is due to the database query limit being exceeded. A test database script at https://www.eucmh.com/testdb.php currently loads the error :
User ‘gunter’ has exceeded the ‘max_questions’ resource (current value: 300000)
The database related to website is ‘eucmh2015’. The above mentioned error occurs when the user ‘gunter’ of this database exceeds the hourly query limit that’s set for username of a database. The hourly query limit is 300000. If this query limit is exceeded, then the WordPress website will redirect to installation page. This setting is in place to ensure that the MySQL database cannot be overloaded with to many query requests.
It appears that, the script(s) related to your website’s plugins/theme/widgets are not closing the MySQL connection after accessing the database and thus causing the query limit to exceed. Unfortunately, we can’t say which exact script(s) is/are causing the issue. Please contact your website developer and have them make sure that the script(s) of your website’s plugins/themes/widgets close the MySQL connection properly and are optimized so that they don’t cause the query limits to be exceeded. It is also possible that, your website’s pages/posts are getting frequent hits from a specific IP address through brute force tools or manually or from other websites. You can check raw logs available in the /stats directory or check the Visitor Statistics for such possibilities and use security plugins to block traffic from unwanted IPs. Please contact your website developer or online forums for more information regarding these kind of plugins.
If you have any further questions, please chat with us at https://www.startlogic.com/chat/ .
Sincerely,
Praful K
Technical Specialist