NextcloudPi Talk

Hello.
I have Nextcloud 18.0.3 installed on Raspberry pi 4, 4Gb Ram, NextcloudPi system. I faced with a problem with Talk - when I turn on Talk and enter the chat section, the page with the history of correspondence is updated for a long time and at the same time all system is not responding. Could you please tell me where to look for solution of this problem?