This means that the php process LFD is talking about is eating too much memory.
You should either investigate and see if that process is allowed to run and use so much memory or you can just tell LFD to ignore the php processes(which is not a good idea) by doing the following: WHM -> Plugins -> ConfigServer Security & Firewall -> lfd Process ignore -> add the process name(/usr/bin/php) to the end of the text area, press Change and then restart lfd
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Actually, you suggested adding php to lfd exclude, which is bad.
You're right, you said LFD was catching on php, I misread the original response, but still, excluding php is a very bad idea, and defeats the purpose of having LFD to begin with
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