Group Mails not fetched since update to 5.7.11

[wallpen]

Hello everybody.
We run two separate EspoCRM instances and since the update from 5.7.6 to 5.7.11 no more group emails are collected. Does anyone else have this problem or any idea what I can do?
All mailboxes are connected via IMAP and the test queries work without problems. The personal mailboxes are also processed well. I'm at a bit of a loss.
Thank for any help,
Andreas

[esforim]

My suggestion is to check the CRON jobs. It might have been disable or the time changed?

Second suggestion (might want to do a test before doing it live) is to just remove the email and add it back again. Alternative change the Fetch since date to see if that "refresh" it.

Is it both instance that having this issue? Or just one of the two?