Cant open project because of duplicating text layer - AE skips the text layer

Hey there 🙂 
I got some weird problem with AE 2021 18.4.1
I open a project, that is stored on a network server. After opeining it, the following problem comes up:

I translated it from german so u guys can understand the error:
After Effects Error: An attempt to duplicate a text object failed. The text layer is skipped. (76 § 53)

This message shows up a couple of time, since the project includes a lot Text Layers, in different compositions. Round about 100 text layers. Its a Lower third template. Very easy, no heavy task. 

The thing is, it was possible to open it up today, but later switching to another project and than going back to it, brought this error, as mention above. Thats weird. What could be the problem? Anyone had the same issue before? 

Is it the stored project, on a network? 
Is it the computer im working on? (Tried opening it on a different one and it worked)

Is it AE/ Adobe?

My suggestions is, that the Network is too slow to communicate with the Network Server. Maybe someone knows it better?

Any help would be great! Thanks in advance 🙂 

Info from the workstation the error came out:
2x CPU Intel Xeon E5 2650 v2 (Dual CPU)
128 GB RAM

2x SSDs

1x HDD
Quadro K6000
1 GBit/s Network connection 

PS: I tried the BETA version too. Same issue. I know that this system is due to the 2x CPUS not very good for this AE usecase, but its an older machine so, here it is.