Welcome @acaus Happy you are here
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Are you using modsecurity ? Disable it and try again
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Probably you reached max children process limit. You can confirm this by checking
/usr/local/lsws/logs/lsrestart.log
to fix this just restart lsws service
$ systemctl restart lsws || service lsws reload
This means you might be having so many php processes running you will need to run High CPU Usage, 4CPU 8GB RAM - #19 by josephgodwinke