Voipfirewalld (Monitor thread) 100% CPU usage

I have a problem with voipfirewalld. It takes always ~100% one CPU-core even, when no one talk and it doesn’t matter if Irqbalanced is running or not.
There are total of 2 cores with 2GB RAM (VMware ESXi 6.0).
Other issues are sometimes interrupted connections or right after call: “Hello? I hear nothing! Hello?”.

Last System Update vor two days. Last fwconsole ma upgradeall - today.

Linux 3.10.0-957.10.1.el7.x86_64 #1 SMP Mon Mar 18 15:06:45 UTC 2019 x86_64 GNU/Linux
FreePBX 14.0.13
Asterisk Version: 13.22.0
PHP Version 5.6.40.
Zend Engine v2.6.0
Zend Guard Loader v3.3 (enabled)
Zend OPcache v7.0.4-dev (up and running)

Modul: firewall | 13.0.59 | Enabled

Active SIP Channel(s): 13
Active PJSIP Channel(s): 2
Active IAX2 Channel(s): 2
Sip Peers:
Online: 36
Offline: 39

I can’t found nothing interesting in LOGs.
The only interesting thing would be ‘pstack’:
0 0x00007f98f760420e in sigtimedwait () from /lib64/libc.so.6
1 0x0000555fe0e48e81 in pcntl_sigwaitinfo.isra.6 ()
2 0x0000555fe0f582db in dtrace_execute_internal ()
3 0x0000555fe1012384 in zend_do_fcall_common_helper_SPEC ()
4 0x0000555fe0fa6688 in execute_ex ()
5 0x0000555fe0f581b9 in dtrace_execute_ex ()
6 0x00007f98efca8f6c in zend_oe () from /usr/lib64/php/modules/ZendGuardLoader.so
7 0x0000555fe1012839 in zend_do_fcall_common_helper_SPEC ()
8 0x0000555fe0fa6688 in execute_ex ()
9 0x0000555fe0f581b9 in dtrace_execute_ex ()
10 0x00007f98efca8f6c in zend_oe () from /usr/lib64/php/modules/ZendGuardLoader.so
11 0x0000555fe101167d in ZEND_INCLUDE_OR_EVAL_SPEC_TMP_HANDLER ()
12 0x0000555fe0fa6688 in execute_ex ()
13 0x0000555fe0f581b9 in dtrace_execute_ex ()
14 0x00007f98efca8f6c in zend_oe () from /usr/lib64/php/modules/ZendGuardLoader.so
15 0x0000555fe0f6af6b in zend_execute_scripts ()
16 0x0000555fe0f05c92 in php_execute_script ()
17 0x0000555fe1014298 in do_cli ()
18 0x0000555fe0d99aba in main ()

When I stop the firewall (fwconsole firewall stop) the CPU-usage goes down to about 10%.

What and where can the problem be? What can I try, that the CPU usage goes down without having to turn off the firewall?

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