How to solve “Suspicious process running under user” and “Excessive resource usage”

Sometimes some necessary processes use a lot of resources on the server and the system often starts to notify about it by email.
For example, as in my case, after installing the Zabbix agent, notifications began to come:

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Solving the problem with freezing DIR-300/NRU/B7 using firmware from Zyxel Keenetic Lite

I noticed on more than 10 DIR-300/NRU/B7 routers that they hang periodically, the Internet disappears, and if the router is included in an unmanaged switch, then the DIR-300/NRU/B7 also hangs it. All official firmware up to 1.4.8 did not solve the problem.

It was possible to solve the problem only with modified firmware from Zyxel Keenetic Lite.

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