Memory runs full and stops services

Hi all,
@pmueller nice catch. Am searching there a little in the dark since we have had the same problems but with different processes. In here → IPFire went down last night, can't find cause - #12 by ummeegge triggers “openvpn-authen{tication}” the OOM-killer, in here → IPFire went down last night, can't find cause - #8 by bonnietwin too .
The scores reflects that → IPFire went down last night, can't find cause - #15 by ummeegge

Currently not sure what this is all about. Are there some changes in sysctl.conf which causes those events ?

Best,

Erik