Just for your info, I'm helping a user who has been seeing this issue since Thunderbird 10 and still does with 52.9.1 on Ubuntu 18.04.1. User currently has one Google account, two CalDav accounts and two IMAP accounts.
Launchpad bug report: https://bugs.launchpad.net/bugs/940631
Just for your info, I'm helping a user who has been seeing this issue since Thunderbird 10 and still does with 52.9.1 on Ubuntu 18.04.1. User currently has one Google account, two CalDav accounts and two IMAP accounts.
Launchpad bug report: https:/ /bugs.launchpad .net/bugs/ 940631