The problem seems to weaken from time to time and then increase again.
Today, an error message was displayed for the first time:
Recently, DC-iOS sometimes crashes at startup.
As far as I can remember, this happened first in version 1.44.1.
Either the Delta Chat logo is displayed at startup and the app freezes or when trying to connect to Chatmail, it is closed. I can’t find anything in the log.
Therefore, I originally wanted to wait until the new log is implemented before reporting the problem. But now I think that the crashes and the connection problem are probably related somehow.