Stuck on reboot/shutdown. Waiting for pids

[pepegotera]

Hi, i request help in order to solve my problem. Since a month ago, i can't shutdown or reboot my truenas.
It is always waiting pids: XXXX. If i press ctrl+c when it is stuck it finally reboot but if i am on remote it is impossible, never ends.

I rebooted two times for test. I capture processes before reboot with ps command:
First reboot Waiting for PIDS: 2222
ps -ax
UID PID PPID C PRI NI VSZ RSS MWCHAN STAT TT TIME COMMAND 0 2221 1 1 52 0 12852 2508 piperd Is - 0:00.00 daemon: /usr/local/sbin/collectd[2222] (daemon) 0 2222 2221 0 20 0 102080 44836 nanslp S - 0:00.15 /usr/local/sbin/collectd -f

Second reboot Waiting for PIDS: 2432
ps -ax
UID PID PPID C PRI NI VSZ RSS MWCHAN STAT TT TIME COMMAND 0 2431 1 3 52 0 12852 2508 piperd Is - 0:00.00 daemon: /usr/local/sbin/collectd[2432] (daemon) 0 2432 2431 0 20 0 106176 44912 nanslp S - 0:00.15 /usr/local/sbin/collectd -f

Someone could help me to solve issue? What does it mean? What could check in order to provide more information?

I have a degraded pool, could it have some relation with this issue?

System:
- TrueNAS-13.0-RELEASE (Upgraded from freenas 11.3 some months ago)
- Intel(R) Core(TM) i5-4460 CPU @ 3.20GHz
- Ram DDR3 16 GB
- Motherboard Gigabyte