sensu-client 100% CPU

Hi all,
it's the second time in few weeks that a sensu-client process goes to
100% CPU and stay until I kill the process. No new checks were added
This sensu-client (latest version, 0.26.3-1 armhf) execute about ten
checks pushed from sensu-server: during this condition, sensu-client
seems working (sensu-client.log still logging performed checks, no
warnings from uchiwa), when I tried to stop it init.d fail:

# /etc/init.d/sensu-client stop
[....] Stopping sensu-client:Timed out waiting for sensu-client to
stop ... failed!

so I need to kill the process:

# ps auuuwwwxxxx | grep 14586
sensu 14586 99.8 1.5 62352 14972 ? Rl Mar12 4187:14
/opt/sensu/embedded/bin/ruby /opt/sensu/bin/sensu-client -b -c
/etc/sensu/config.json -d /etc/sensu/conf.d -e /etc/sensu/extensions
-p /var/run/sensu/ -l /var/log/sensu/sensu-client.log
-L info


# kill -9 14586

I found no evidences in sensu-client.log... What's next in
troubleshooting steps?