I've tried reboot, didn't help. I've deleted everything under /etc/cfg_mnt. Router created new ones. I've also deleted everything under /jffs/.le but none of them helped. Just before this "watchdog" uses high CPU and this comes with using more CPU.
If you don't have any idea it's OK I can live with it
I see I still use a mixture of Asus's new cfgsync code and my previous workaround, which probably causes the cert to be re-generated everytime a service tries to restart cfgsync (since the location is different). There's a good chance that's what is causing your issue.