Sounds like the same problem I had after updating. Thanks to some great assistance the problem was solved by changing the Remote CDR DB Port to nothing from 3306.
To verify, just login to Mysql, use the asterisk db and run
select value from freepbx_settings where name=‘Remote CDR DB Port’;
If it comes back with 3306 remove it.
update freepbx_settings set value=“” where name=‘Remote CDR DB Port’;