I just got it during the day.
I see it recovered default ~lxcenter.conf and Apache was crashing because too small Server Limit...
Now I used apache-optimize and got this:
Timeout 150
KeepAlive Off
MaxKeepAliveRequests 100
KeepAliveTimeout 15
ServerLimit 2000
<IfModule prefork.c>
StartServers 2
MinSpareServers 14
MaxSpareServers 28
ServerLimit 28
<IfVersion >= 2.4>
MaxRequestWorkers 28
MaxConnectionsPerChild 2000
</IfVersion>
<IfVersion < 2.4>
MaxClients 28
MaxRequestsPerChild 2000
</IfVersion>
MaxMemFree 2
SendBufferSize 65536
ReceiveBufferSize 65536
</IfModule>
<IfModule itk.c>
StartServers 2
MinSpareServers 14
MaxSpareServers 28
ServerLimit 28
<IfVersion >= 2.4>
MaxRequestWorkers 28
MaxConnectionsPerChild 2000
</IfVersion>
<IfVersion < 2.4>
MaxClients 28
MaxRequestsPerChild 2000
</IfVersion>
MaxMemFree 2
SendBufferSize 65536
ReceiveBufferSize 65536
</IfModule>
<IfModule worker.c>
StartServers 2
MinSpareThreads 12
MaxSpareThreads 24
ThreadsPerChild 25
<IfVersion >= 2.4>
MaxRequestWorkers 1000
MaxConnectionsPerChild 0
</IfVersion>
<IfVersion < 2.4>
MaxClients 1000
MaxRequestsPerChild 0
</IfVersion>
ThreadStackSize 8196
MaxMemFree 2
SendBufferSize 65536
ReceiveBufferSize 65536
</IfModule>
<IfModule event.c>
StartServers 2
MinSpareThreads 12
MaxSpareThreads 24
ThreadsPerChild 25
MaxRequestsPerChild 0
ThreadStackSize 8196
<IfVersion >= 2.4>
MaxRequestWorkers 1000
MaxConnectionsPerChild 0
</IfVersion>
<IfVersion < 2.4>
MaxClients 2000
MaxRequestsPerChild 0
</IfVersion>
SendBufferSize 65536
ReceiveBufferSize 65536
</IfModule>
Include /opt/configs/apache/conf/defaults/*.conf
Include /opt/configs/apache/conf/domains/*.conf
but load it way too high !!! I use 6-core Core i7 990x 3.47 GHz, 24 GB DDR3, 2x 240 GB SSD for system/MariaDB + 2x 3 TB for /home