NEW - INCOMING Gmail Imap Failure

Great Problem, Please help.

Latest SuiteCRM Version 7.11.18
Sugar Version 6.5.25 (Build 344)

For years our SuiteCRM-Installation has been running perfectly fine .
We do all the updates and are up to date.

But suddenly we can’t register any additional incoming email account with gmail.
**The IMAP connection during installation always shows connection errors. **
This is despite the fact that all the details are correct and all the details are exactly the same as for the fine working gmail accounts - created earlier.

The former installed incoming gmail imap accounts are working with no problems in the same SuiteCRM installation!

Please help. Is it a new bug in the SuiteCRM updates or are there some changes made by gmail ?