pvestadt stucks - lxc status update error: can't open [..]

[encore]

Hi,

we are facing issues with one node what only hosts LXC CTs.
pvestatd stucks and shows the following error messages:

Jul 06 12:32:32 captive001-72001-bl03 pvestatd[9496]: status update time (39.882 seconds)
Jul 06 12:32:53 captive001-72001-bl03 pvestatd[9496]: lxc status update error: can't open '/sys/fs/cgroup/cpuacct/lxc/9779/ns/cpuacct.stat' - No such file or directory
Jul 06 12:33:09 captive001-72001-bl03 pvestatd[9496]: lxc console cleanup error: can't open '/sys/fs/cgroup/cpuacct/lxc/9780/ns/cpuacct.stat' - No such file or directory
Jul 06 12:33:09 captive001-72001-bl03 pvestatd[9496]: status update time (36.960 seconds)
Jul 06 12:33:30 captive001-72001-bl03 pvestatd[9496]: lxc status update error: can't open '/sys/fs/cgroup/cpuacct/lxc/2162/ns/cpuacct.stat' - No such file or directory
Jul 06 12:33:55 captive001-72001-bl03 pvestatd[9496]: lxc console cleanup error: can't open '/sys/fs/cgroup/cpuacct/lxc/2162/ns/cpuacct.stat' - No such file or directory
Jul 06 12:33:55 captive001-72001-bl03 pvestatd[9496]: status update time (45.842 seconds)
Jul 06 12:34:10 captive001-72001-bl03 pvestatd[9496]: lxc status update error: can't open '/sys/fs/cgroup/cpuacct/lxc/9769/ns/cpuacct.stat' - No such file or directory
Jul 06 12:34:31 captive001-72001-bl03 pvestatd[9496]: lxc console cleanup error: can't open '/sys/fs/cgroup/cpuacct/lxc/10211/ns/cpuacct.stat' - No such file or directory
Jul 06 12:34:31 captive001-72001-bl03 pvestatd[9496]: status update time (35.796 seconds)

When I restart those CTs it will be fixed for them but some minutes later it happens on other CTs.

Found this:
https://forum.proxmox.com/threads/lxc-console-cleanup-error.38293/
A proxmox update should fix that issue, but I am at the newest version:

root@captive001-72001-bl03:~# pveversion
pve-manager/5.2-5/eb24855a (running kernel: 4.15.17-3-pve)

Any ideas?