Which MONyog build are you using? Can you update to latest build v4.72
Please mention information listed below:
1) How many servers are registered?
2) Are you using SSH tunnel to connect to MySQL server?
3) Are you collecting OS metrics?
4) How much is the Data collection Interval time?
5) Processlist/proxy Sniffer is enabled?
6) Is Email Notification is enabled?
7) Mention OS where MONyog is running? If linux send us output of these commands:
i) uname -a
ii)cat /etc/issue
Also, You can create a support ticket by sending an email to '[email protected]'