after a few months has passed that my printer has stopped working with Octoprint, i want to share my solution to this.
At the beginning i started with Octoprint 1.3.6 and had no issues with this setup. After updating to 1.3.7 I got always communication issues reported - I downgraded to 1.3.6 but this was also not working afterwards ( i thought the update caused this - but it seems not).
With the updates 1.3.8 and 1.3.9 it was again not working. I also tried to changed the settings as mentioned in this topic OctoPrint 1.3.7/1.3.8 is stuck in "Pausing" or "Cancelling" without any proper working results ( only in 1.3.8 it sometimes started to print ).
In between I had to print with the SD card directly inserted in the printer .
The problem was:
Printer heated up bed and nozzle, and after positioning X,Y,Z to home position it stuck.
In the terminal I got frequently connection issues ( during heating up ) and also format errors reported (when it should start the print ).
The solution was:
I changed in the printer general settings the connection speed to 9600 Baud and also in Octoprint, since then its working.