syncroton memory error

Hello list.

I made second Kolab16 server at CentOS7. Both virtual at the same host.
First one works well and has no problems. Second one Use CPU 10-20%,
more often 20% and often reach 90% of 8GB RAM (with 4G swapped
permanently). The first one use cca 1GB of 4GB. I discovered at
/var/log/kolab-syncroton/errors this strange message which repeats each
minute:
[04-May-2018 15:55:31 Europe/Berlin] PHP Fatal error:  Allowed memory
size of 134217728 bytes exhausted (tried to allocate 54772603 bytes) in
/usr/share/kolab-syncroton/lib/ext/Syncroton/Model/AXMLEntry.php on
line 199

At line 199 is:

198        // Replace ASCII control-characters
199        return preg_replace('/[\x00-\x08\x0B\x0C\x0E-\x1F]/', '',
$dirty);

Can someone help where could be a trouble? This problem is the same
after last update too.

Thank you very much for ideas.

Greetings,
ladas

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