Trying to change any LXC/VPS properites: TASK ERROR: unable to open file '/etc/pve/nodes/prx1/lxc/115.conf.tmp.3825021' - Input/output error

[openaspace]

Hi.
After applying latest kernel and various updates i have this error trying to modify an lxc or vps:
TASK ERROR: unable to open file '/etc/pve/nodes/prx1/lxc/115.conf.tmp.3825021' - Input/output error

 

[openaspace]

after a reboot now works.
what can happen?