Attatchment is deleting itself

Hello,
I am currently testing a train system from myself, and have the following issue:

Completely random, some coaches are gone. I found out, that somehow the attatchments, which connected the bogies, deletet itselfs.

I thought, the welding script was the problem, but even when i welded the whole model myself, the issue was still there.

has anyone experienced this too?

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