Question UnityTimeOutException after altering environment

Hi everyone!
So I have a unity timeout exception that newly occured in my project, after i made small and simple changes to my environment:

My environment is an alteration of the PushBlockCollab project by unity, but I added a second team and wanted to use self-play in order to train the agents.
Firstly I tried to train in said environment, but the the training didnt work as expected, which is why i wanted to make the environment smaller/easier. Initially this worked, but after making it a little bit more smaller, the error occured.

Here is the original environemt i designed (which is working just fine):


Here is the easier/smaller environemt(which doesnt work):


I did not change anything in code, and since everything is working in the bigger environment i doubt that it is one of the three proposed solutions from the error message.
Furthermore, the error does not occure at the same time: Everytime i train the model it occures at a different time (mostly between 100 000 and 600 000 steps).

Does anyone have any idea where my problem could be? You would really help me out!
Thanks a lot!
Leon