High CPU usage in cPanel VPS (Database Connection Error)

Hello, guys, I am new here and have little knowledge on troubleshooting you can consider me as a beginner on WHM/SQL troubleshooting. so I have shared some screenshots below but i dont know how can I troubleshoot the problem website goes down 3 or 4 times a week some time for few minutes and sometimes for hours Kindly check the screenshots my.cnf WHM Process Manager VPS Server Specs: CPU: Intel(R) Xeon(R) CPU E3-1230 V2 @ 3.30GHz (8 Core) RAM: 16384 MB OS: CentOS 6.4 x86_64 HD: 1024 GB mysqladmin proc stat: