You open the parts, save them in another folder and check the versions of the parts and the types. You close everything and then you reopen the whole thing. Basically, you recreate links between the parts and the assembly.
The recordings don't change anything, I just did the manipulation of moving the pieces + together in another folder. For the moment it is opening. The problem is that my problem is random. I will make the observation the next time I restart my position.
You tried to redo a reassembly from some of your parts, at least you would know if it is one of the parts that cause concern, if it is the whole, and especially if you redo your assembly does it work or does it keep you this problem??? because I don't really see why he loses the paths like that... Also check in the error messages that you don't know if there is not the solution, at the very bottom in tools/options "Messages/errors/warning".